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Engine Parts & Tuning Hardware

Unleash Your Engine's Power: Performance Parts & Accessories

At Optimiz Access, we offer a vast lineup of engine performance parts and accessories to boost the output of your sports vehicle or premium automobile. Optimize your engine for extreme performance and enjoy an exhilarating driving experience on both road and track.

Key benefits of engine tuning: substantial horsepower and torque gains for rapid acceleration, sharper throttle response, enhanced mechanical reliability using high-strength components, and tailored custom tuning suited to all engines.

Essential Products to Maximize Engine Performance

Discover all our precision-engineered components designed to increase efficiency and durability in your engine block:

  • Cold Air Intakes & Air Filtration – Performance sports filters and carbon intake systems for maximum air filling.
  • Intercoolers & Charge Coolers – Efficient intake air cooling to sustain consistent power output under heavy loads.
  • Forged Pistons & Connecting Rods – Heavy-duty internal components built to withstand extreme temperatures and boost pressures.
  • Turbos & Superchargers – Forced induction upgrades delivering significant power increases.
  • Ignition & Servicing – Competition spark plugs, high-output ignition coils, and high-performance oil filters.

Industry-Leading Benchmark Brands

We stock top tuning and motorsport manufacturers: Wagner Tuning, Forge Motorsport, Magnecor, Green Filter, BMC Filter, NGK, Vibra Technics, and Powerflex. We also supply OEM factory parts to ensure meticulous engine maintenance.

Why you should Choose Optimiz Access for Your Engine Upgrades

Since 2010, Optimiz Access has specialized in selecting top-tier engine components for the custom upgrading and maintenance of sports vehicles. Located in northern France (Hauts-de-France) — near Lille, Valenciennes, Cambrai, Arras, Seclin, Douai, and Saint-Quentin —, our expert technicians guide your hardware selection and provide professional installation in our workshop. We ensure strict quality control along with fast worldwide shipping.

Unleash Your Engine's Full Potential Today

Give your car the raw power and sharp response it deserves. Trust the expertise of Optimiz Access, select your engine performance parts today, and benefit from our fast dispatch.

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  • Categories: Alimentation
  • Categories: Circuit d'air
  • Categories: Kit Allègement
  • Categories: Suralimentation (Turbo)
Specific Accessory Belt for A/C Delete Kit Renault Clio 4 RS
      The Optimiz Access Specific Accessory Belt is the essential part required to finalize the installation of the A/C Delete Kit on your Renault Clio 4 RS . Due to the change in the path and distance between the pulleys following the removal of the air conditioning compressor, the original belt can...
      €29.34Price
      Specific Accessory Belt for A/C Delete Kit Renault Clio 4 RS
          The Optimiz Access Specific Accessory Belt is the essential part required to finalize the installation of the A/C Delete Kit on your Renault Clio 4 RS . Due to the change in the path and distance between the pulleys following the removal of the air conditioning compressor, the original belt can...
          €29.34Price
          En Stock
          €29.62 Price
          En Stock
          €29.62 Price
          Vis creuse tuyauterie alimentation huile Megane RS
              Vis creuse tuyauterie alimentation huile Megane 2 et 3 RS
              €29.62Price
              Vis creuse tuyauterie alimentation huile Megane RS
                  Vis creuse tuyauterie alimentation huile Megane 2 et 3 RS
                  €29.62Price
                  Câble alimentation protection batterie Megane 3 RS et N4
                      Câble alimentation protection batterie Megane 3 RS et N4
                      €96.72Price
                      Câble alimentation protection batterie Megane 3 RS et N4
                          Câble alimentation protection batterie Megane 3 RS et N4
                          €96.72Price
                          En Stock
                          €361.00 Price
                          En Stock
                          €361.00 Price
                          Kit Admisssion Forge Motorsport Megane 4 RSKit Admisssion Forge Motorsport Megane 4 RS
                              Kit Admisssion Forge Motorsport Megane 4 RS Produit developpé dans le but de  - Garder des temperatures d'admission interessantes et les plus basses possibles - Ameliorer l'afflux d'air - Ameliorer l'esthetique de la baie moteur Apres de nombreux essais, les resultats obtenus sont + 15ch Ce gain peut etre superieur en associant ce kit...
                              €361.00Price
                              Kit Admisssion Forge Motorsport Megane 4 RSKit Admisssion Forge Motorsport Megane 4 RS
                                  Kit Admisssion Forge Motorsport Megane 4 RS Produit developpé dans le but de  - Garder des temperatures d'admission interessantes et les plus basses possibles - Ameliorer l'afflux d'air - Ameliorer l'esthetique de la baie moteur Apres de nombreux essais, les resultats obtenus sont + 15ch Ce gain peut etre superieur en associant ce kit...
                                  €361.00Price
                                  Dispo selon configuration
                                  €379.68 €399.66 Regular price -€19.98 off Price
                                  Dispo selon configuration
                                  €379.68 €399.66 Regular price -€19.98 off Price
                                  Kit Dump Valve HKS Megane 2 RS
                                    • Pack
                                    Kit complet permettant l'installation d'une dump valve HKS sans nécessiter de produit additionnel.
                                    €379.68€399.66Regular price-€19.98 offPrice
                                    Kit Dump Valve HKS Megane 2 RS
                                      • Pack
                                      Kit complet permettant l'installation d'une dump valve HKS sans nécessiter de produit additionnel.
                                      €379.68€399.66Regular price-€19.98 offPrice
                                      En Stock
                                      €32.92 Price
                                      En Stock
                                      €32.92 Price
                                      Rampe injection Clio 2 RS 172 phase 2 et 182
                                          Fuel injection rail Renault Clio 2 RS Phase 2 & 3 Give your Renault Clio 2 RS Phase 2 or 3 an optimum fuel supply with the genuine Renault injection rail! Designed for sports driving enthusiasts, this rail guarantees a constant and precise fuel flow, even at high engine speeds, for optimum performance and an unrivalled driving experience. ...
                                          €32.92Price
                                          Rampe injection Clio 2 RS 172 phase 2 et 182
                                              Fuel injection rail Renault Clio 2 RS Phase 2 & 3 Give your Renault Clio 2 RS Phase 2 or 3 an optimum fuel supply with the genuine Renault injection rail! Designed for sports driving enthusiasts, this rail guarantees a constant and precise fuel flow, even at high engine speeds, for optimum performance and an unrivalled driving experience. ...
                                              €32.92Price
                                              Dispo selon configuration
                                              €330.87 €367.63 Regular price -€36.76 off Price
                                              Dispo selon configuration
                                              €330.87 €367.63 Regular price -€36.76 off Price
                                              Kit Dump Valve HKS Megane 3 RSKit Dump Valve HKS Megane 3 RS
                                                • Pack
                                                Kit Dump Valve HKS Megane 3 RS Le kit est complet et permet donc de monter une dump HKS sans necessité d'acheter d'autres pieces.
                                                €330.87€367.63Regular price-€36.76 offPrice
                                                Kit Dump Valve HKS Megane 3 RSKit Dump Valve HKS Megane 3 RS
                                                  • Pack
                                                  Kit Dump Valve HKS Megane 3 RS Le kit est complet et permet donc de monter une dump HKS sans necessité d'acheter d'autres pieces.
                                                  €330.87€367.63Regular price-€36.76 offPrice
                                                  Vis de fixation poulie folle clim Clio 3 RS - Megane 2 RS - Megane 3 RSVis de fixation poulie folle clim Clio 3 RS - Megane 2 RS - Megane 3 RS
                                                      Vis de fixation poulie folle clim Clio 3 RS - Megane 2 RS - Megane 3 RS. Vendue à l'unité - 3 Vis sont nécessaires
                                                      €2.34Price
                                                      Vis de fixation poulie folle clim Clio 3 RS - Megane 2 RS - Megane 3 RSVis de fixation poulie folle clim Clio 3 RS - Megane 2 RS - Megane 3 RS
                                                          Vis de fixation poulie folle clim Clio 3 RS - Megane 2 RS - Megane 3 RS. Vendue à l'unité - 3 Vis sont nécessaires
                                                          €2.34Price
                                                          Régulateur (membrane) pression gaz collecteur admission Clio 3 RS
                                                              Régulateur pression gaz carter Clio 3 RS
                                                              €61.60Price
                                                              Régulateur (membrane) pression gaz collecteur admission Clio 3 RS
                                                                  €61.60Price
                                                                  Joint anti-usure jonction écope divergent Twingo R2
                                                                      Joint anti-usure jonction écope divergent Twingo R2 Référence: 7711167594
                                                                      €8.48Price
                                                                      Joint anti-usure jonction écope divergent Twingo R2
                                                                          Joint anti-usure jonction écope divergent Twingo R2 Référence: 7711167594
                                                                          €8.48Price
                                                                          Pompe essence modifiée Clio Gr NModified Fuel Pump DASH Fitting Renault Sport for Renault Clio 2 Gr N (7711129520)
                                                                            • Pack
                                                                            Do not take the risk of seeing the performance of your Renault Clio 2 Group N drop sharply. Without a stable and optimal fuel supply, you lose your advantage on the track. This modified fuel pump (Reference 7711129520 ) is the official Renault Sport part essential for maintaining...
                                                                            €269.74Price
                                                                            Pompe essence modifiée Clio Gr NModified Fuel Pump DASH Fitting Renault Sport for Renault Clio 2 Gr N (7711129520)
                                                                              • Pack
                                                                              Do not take the risk of seeing the performance of your Renault Clio 2 Group N drop sharply. Without a stable and optimal fuel supply, you lose your advantage on the track. This modified fuel pump (Reference 7711129520 ) is the official Renault Sport part essential for maintaining...
                                                                              €269.74Price
                                                                              Dump Valve Megane 3 RS avec Kit de montageDump Valve Megane 3 RS avec Kit de montage
                                                                                  Kit Dump Valve Forge. Circuit ouvert. Ce mode de fonctionnement est reconnaissable au PSSCHHIIIITTT qui se laisse entendre lors du changement de rapport Le kit Comprend, la Dump Valve, 2 colliers, un raccord inox, et un tube coudé et le bouchon nécessaire à boucher le trou lors de la suppression de la dump valve d'origine (pas present dans tous les kits que l'on trouve sur le net). Idéal sur...
                                                                                  €261.86Price
                                                                                  Dump Valve Megane 3 RS avec Kit de montageDump Valve Megane 3 RS avec Kit de montage
                                                                                      Kit Dump Valve Forge. Circuit ouvert. Ce mode de fonctionnement est reconnaissable au PSSCHHIIIITTT qui se laisse entendre lors du changement de rapport Le kit Comprend, la Dump Valve, 2 colliers, un raccord inox, et un tube coudé et le bouchon nécessaire à boucher le trou lors de la suppression de la dump valve d'origine (pas present dans tous les kits que l'on trouve sur le net). Idéal sur...
                                                                                      €261.86Price
                                                                                      En Stock
                                                                                      €150.77 Price
                                                                                      En Stock
                                                                                      €150.77 Price
                                                                                      Bride de turbo Megane N4
                                                                                          Official Renault Megane N4 Rally Turbo Flange (Ref: 7711167131) : Original part, guaranteeing performance and reliability for your Renault Megane 3 RS prepared for competition. Don't let an unsuitable flange compromise your turbo's potential. Discover related products, including the O-ring, at the bottom of this page.
                                                                                          €150.77Price
                                                                                          Bride de turbo Megane N4
                                                                                              Official Renault Megane N4 Rally Turbo Flange (Ref: 7711167131) : Original part, guaranteeing performance and reliability for your Renault Megane 3 RS prepared for competition. Don't let an unsuitable flange compromise your turbo's potential. Discover related products, including the O-ring, at the bottom of this page.
                                                                                              €150.77Price
                                                                                              Echangeur air/air Megane 3 RS et N4Genuine Renault Air/Air Intercooler for Mégane 3 RS and N4
                                                                                                  Don't accept any loss of performance for your Mégane 3 RS or Mégane N4 ! This strictly genuine Renault air/air intercooler is the cornerstone for maintaining your engine's power and reliability. Without it, your sports vehicle risks never reaching its full potential, especially in extreme conditions. Find complementary products at the bottom...
                                                                                                  €493.96Price
                                                                                                  Echangeur air/air Megane 3 RS et N4Genuine Renault Air/Air Intercooler for Mégane 3 RS and N4
                                                                                                      Don't accept any loss of performance for your Mégane 3 RS or Mégane N4 ! This strictly genuine Renault air/air intercooler is the cornerstone for maintaining your engine's power and reliability. Without it, your sports vehicle risks never reaching its full potential, especially in extreme conditions. Find complementary products at the bottom...
                                                                                                      €493.96Price
                                                                                                      Fixations Forge Capteur Sur RadiateurFORGE MOTORSPORT FMRCLMP Sensor Securing Kit - Megane 2 RS
                                                                                                          Secure the sensors of your Megane 2 RS with the FORGE MOTORSPORT FMRCLMP kit. Composed of 2 reinforcements, it ensures optimal support for the depression hose and pressure sensor. Avoid performance losses and reliability issues.
                                                                                                          €36.80Price
                                                                                                          Fixations Forge Capteur Sur RadiateurFORGE MOTORSPORT FMRCLMP Sensor Securing Kit - Megane 2 RS
                                                                                                              Secure the sensors of your Megane 2 RS with the FORGE MOTORSPORT FMRCLMP kit. Composed of 2 reinforcements, it ensures optimal support for the depression hose and pressure sensor. Avoid performance losses and reliability issues.
                                                                                                              €36.80Price
                                                                                                              Genuine Renault Sport throttle position potentiometer for Twingo R2, Clio R3, and X85 Cup racing engines.
                                                                                                                  Do not risk unpredictable ignition cuts during a rally stage, a sudden loss of immediate throttle response, or an abrupt limp-mode activation that freezes your lap times on track. The genuine Potentiomètre papillon Twingo R2, Clio R3 et X85 Cup is the official factory-spec...
                                                                                                                  €138.05Price
                                                                                                                  Genuine Renault Sport throttle position potentiometer for Twingo R2, Clio R3, and X85 Cup racing engines.
                                                                                                                      Do not risk unpredictable ignition cuts during a rally stage, a sudden loss of immediate throttle response, or an abrupt limp-mode activation that freezes your lap times on track. The genuine Potentiomètre papillon Twingo R2, Clio R3 et X85 Cup is the official factory-spec...
                                                                                                                      €138.05Price
                                                                                                                      En Stock
                                                                                                                      €720.00 Price
                                                                                                                      En Stock
                                                                                                                      €720.00 Price
                                                                                                                      Echangeur Airtec Megane 3 RSEchangeur Airtec Megane 3 RS
                                                                                                                          Échangeur Airtec spécifique à la Mégane 3 RS. Échangeur de 60 mm se montant en lieu et place sans modifications et équipé d'une tôle permettant de diriger un plus gros flux d'air vers l’échangeur. Disponible en gris
                                                                                                                          €720.00Price
                                                                                                                          Echangeur Airtec Megane 3 RSEchangeur Airtec Megane 3 RS
                                                                                                                              Échangeur Airtec spécifique à la Mégane 3 RS. Échangeur de 60 mm se montant en lieu et place sans modifications et équipé d'une tôle permettant de diriger un plus gros flux d'air vers l’échangeur. Disponible en gris
                                                                                                                              €720.00Price
                                                                                                                              En Stock
                                                                                                                              €23.50 Price
                                                                                                                              En Stock
                                                                                                                              €23.50 Price
                                                                                                                              Kit Revision Dump Valve Recirculation Forge
                                                                                                                                  Kit revision pour Dump Valve Forge comprenant: - 1 sachet de graisse - un piston - joints toriques 
                                                                                                                                  €23.50Price
                                                                                                                                  Kit Revision Dump Valve Recirculation Forge
                                                                                                                                      Kit revision pour Dump Valve Forge comprenant: - 1 sachet de graisse - un piston - joints toriques 
                                                                                                                                      €23.50Price
                                                                                                                                      En Stock
                                                                                                                                      €17.45 Price
                                                                                                                                      En Stock
                                                                                                                                      €17.45 Price
                                                                                                                                      Support inférieur écope boitier filtre Twingo R2
                                                                                                                                          Support inférieur écope boitier filtre Twingo R2 Référence: 7711167597
                                                                                                                                          €17.45Price
                                                                                                                                          Support inférieur écope boitier filtre Twingo R2
                                                                                                                                              Support inférieur écope boitier filtre Twingo R2 Référence: 7711167597
                                                                                                                                              €17.45Price
                                                                                                                                              En Stock
                                                                                                                                              €13.20 Price
                                                                                                                                              En Stock
                                                                                                                                              €13.20 Price
                                                                                                                                              Joint Plenum Clio 3 RSJoint Plenum Clio 3 RS
                                                                                                                                                  Joint Plenum Clio 3 RS Joint permettant de faire l’étanchéité entre le moteur et le collecteur d'admission. Il est conseillé de le changer lors à chaque démontage
                                                                                                                                                  €13.20Price
                                                                                                                                                  Joint Plenum Clio 3 RSJoint Plenum Clio 3 RS
                                                                                                                                                      Joint Plenum Clio 3 RS Joint permettant de faire l’étanchéité entre le moteur et le collecteur d'admission. Il est conseillé de le changer lors à chaque démontage
                                                                                                                                                      €13.20Price
                                                                                                                                                      High-tensile steel replacement tuning preload spring for Forge Motorsport dump valves.
                                                                                                                                                          Prevent boost pressure leaks and excessive throttle response lag on your turbocharged engine block. This premium Forge Dump Valve Preload Spring features an uprated mechanical rating designed specifically to maintain the internal piston seal of your bypass valve under high...
                                                                                                                                                          €10.93Price
                                                                                                                                                          High-tensile steel replacement tuning preload spring for Forge Motorsport dump valves.
                                                                                                                                                              Prevent boost pressure leaks and excessive throttle response lag on your turbocharged engine block. This premium Forge Dump Valve Preload Spring features an uprated mechanical rating designed specifically to maintain the internal piston seal of your bypass valve under high...
                                                                                                                                                              €10.93Price
                                                                                                                                                              Dispo selon configuration
                                                                                                                                                              €199.00 Price
                                                                                                                                                              Dispo selon configuration
                                                                                                                                                              €199.00 Price
                                                                                                                                                              Admission Forge Clio 4 RS Euro 6Admission Forge Clio 4 RS Euro 6
                                                                                                                                                                  Ce kit est spécialement conçu pour la Renault Clio 4 RS Trophy (ne convient pas aux clio 4 RS non Trophy) Il comprend le tuyau de silicone conçu sur mesure combiné avec un haut débit filtre de cône non huilée en coton permettant une excellente filtration. Tout le nécessaire est fourni dans le kit, y compris les colliers en acier inoxydable de qualité. Ce kit a été testé et permet un gain...
                                                                                                                                                                  €199.00Price
                                                                                                                                                                  Admission Forge Clio 4 RS Euro 6Admission Forge Clio 4 RS Euro 6
                                                                                                                                                                      Ce kit est spécialement conçu pour la Renault Clio 4 RS Trophy (ne convient pas aux clio 4 RS non Trophy) Il comprend le tuyau de silicone conçu sur mesure combiné avec un haut débit filtre de cône non huilée en coton permettant une excellente filtration. Tout le nécessaire est fourni dans le kit, y compris les colliers en acier inoxydable de qualité. Ce kit a été testé et permet un gain...
                                                                                                                                                                      €199.00Price
                                                                                                                                                                      En Stock
                                                                                                                                                                      €81.58 Price
                                                                                                                                                                      En Stock
                                                                                                                                                                      €81.58 Price
                                                                                                                                                                      Flexible de carburant Té vers rampe Twingo R1 - Clio R3 Max
                                                                                                                                                                          Do not let a preventable engine failure ruin your race weekend. This high-pressure fuel hose , an authentic Renault Sport component (references 7711160195 / 7711162420 ), is the critical link between the T-connector and the fuel injector rail . Specifically engineered for Twingo R1,...
                                                                                                                                                                          €81.58Price
                                                                                                                                                                          Flexible de carburant Té vers rampe Twingo R1 - Clio R3 Max
                                                                                                                                                                              Do not let a preventable engine failure ruin your race weekend. This high-pressure fuel hose , an authentic Renault Sport component (references 7711160195 / 7711162420 ), is the critical link between the T-connector and the fuel injector rail . Specifically engineered for Twingo R1,...
                                                                                                                                                                              €81.58Price
                                                                                                                                                                              Multi-layer reinforced silicone turbo boost hose kit by Forge Motorsport for Renault Megane 2 RS.Silicone Turbo Hose Kit Forge | Renault Megane 2 RS
                                                                                                                                                                                  Do not risk a sudden loss of boost pressure during a hard acceleration pull, a split factory duct caused by extreme engine bay heat, or an efficiency drop at your intercooler cores. The premium Kit Durites (Tubulures) Turbo Forge Motorsport pour Megane 2 RS replaces...
                                                                                                                                                                                  €241.00Price
                                                                                                                                                                                  Multi-layer reinforced silicone turbo boost hose kit by Forge Motorsport for Renault Megane 2 RS.Silicone Turbo Hose Kit Forge | Renault Megane 2 RS
                                                                                                                                                                                      Do not risk a sudden loss of boost pressure during a hard acceleration pull, a split factory duct caused by extreme engine bay heat, or an efficiency drop at your intercooler cores. The premium Kit Durites (Tubulures) Turbo Forge Motorsport pour Megane 2 RS replaces...
                                                                                                                                                                                      €241.00Price