Rear Diffusers
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- Stillen®Matte Black Rear Diffuser (KB11235MB)Rear Diffuser (KB11235MB) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$362.11
- Stillen®Matte Black Rear Diffuser (KB11222MB)Rear Diffuser (KB11222MB) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$321.86
- Stillen®Rear Diffuser (Unpainted) (KB12846)Rear Diffuser (KB12846) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$327.43
- Stillen®Rear Diffuser (Unpainted) (KB26002)Rear Diffuser (KB26002) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$350.82
- Stillen®Rear Diffuser (Unpainted) (KB31002)Rear Diffuser (KB31002) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$256.39
- Stillen®Rear Diffuser (Unpainted) (KB25002)Rear Diffuser (KB25002) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$253.92
- Stillen®Rear Diffuser (Unpainted) (KB13145)Rear Diffuser (KB13145) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$303.23
- Stillen®Rear Diffuser (Unpainted) (KB12818)Rear Diffuser (KB12818) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$252.33
- Stillen®Rear Diffuser (Unpainted) (KB127418)Rear Diffuser (KB127418) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$252.33
- Stillen®Rear Diffuser (Unpainted) (KB11241)Rear Diffuser (KB11241) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$252.25
- Stillen®Rear Diffuser (Unpainted) (KB11235)Rear Diffuser (KB11235) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$298.05
- Stillen®Rear Diffuser (Unpainted) (KB11222)Rear Diffuser (KB11222) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$252.25
- Stillen®Rear Valance (Unpainted) (KB11928)Rear Valance by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the experts when it comes to designing,...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$393.68
- Stillen®Short Version Rear Diffuser Kit (Unpainted) (FGT102000S)Short Version Rear Diffuser Kit (FGT102000S) by Stillen®. Ready to Prime and Paint. Personalize your ride with a Stillen rear diffuser! Stillen has been manufacturing polyurethane body styling parts for over 30 years. Stillen the...Part Comes Pre-Installed with 3M Automotive Tape (Same as OEM uses)No Cutting or Modification to Bumper - Removable$378.21
- Extreme Dimensions®R-1 Style Rear Diffuser (Unpainted) (107421)R-1 Style Rear Diffuser (107421) by Extreme Dimensions®. This product will make your car look like it's glued to the road. And its flexible Urethane construction will ensure it stays looking good. Installation typically requires...Stylish and aerodynamicFlexible and durable$183.00
- Vicrez®Auto Body Plastic Repair Complete Set (vzt107)Universal Auto Body Plastic Repair Complete Set (vzt107) by Vicrez®. The Vicrez Auto Body Plastic Repair Complete Set comes with needed to start working on your project right away. Vicrez packages its industrial/commercial products for...Industry-standard Dispenser for Dual-Barrel cartridgesKit Includes an integrated dual-ratio plunger, usable for both 1:1 and 2:1 ratio cartridges$178.84
- Vicrez®Auto Body Plastic Repair Complete Set (vzt106)Universal Auto Body Plastic Repair Complete Set (vzt106) by Vicrez®. The Vicrez Auto Body Plastic Repair Complete Set comes with needed to start working on your project right away. Vicrez packages its industrial/commercial products for...Industry-standard Dispenser for Dual-Barrel cartridgesKit Includes an integrated dual-ratio plunger, usable for both 1:1 and 2:1 ratio cartridges$66.76
- Vicrez®Auto Body Plastic Repair Kit (vzr101-400)Universal Auto Body Plastic Repair Kit (vzr101-400) by Vicrez®. Auto Body Plastic Bumper Repair kit is auto body industry standard, two-component adhesive that cures in about 120 seconds. You can use this adhesive/ filler to repair any...Made in USAHelps to elevate your vehicle above the masses$95.97
- Vicrez®Auto Body Plastic Repair Kit (vzr101-50)Universal Auto Body Plastic Repair Kit (vzr101-50) by Vicrez®. Auto Body Plastic Bumper Repair kit is auto body industry standard, two-component adhesive that cures in about 120 seconds. You can use this adhesive/ filler to repair any...Made in USAHelps to elevate your vehicle above the masses$22.63
- Vicrez®Auto Body Plastic Repair Kit (vzr101-300)Universal Auto Body Plastic Repair Kit (vzr101-300) by Vicrez®. Auto Body Plastic Bumper Repair kit is auto body industry standard, two-component adhesive that cures in about 120 seconds. You can use this adhesive/ filler to repair any...Made in USAHelps to elevate your vehicle above the masses$64.96
- Vicrez®Dual Epoxy/Caulking Cartridge Dispensing Gun (vzt102)Universal Dual Epoxy/Caulking Cartridge Dispensing Gun (vzt102) by Vicrez®. Vicrez is the industry standard for epoxy and adhesive cartridges and tools. The Vicrez Dual Epoxy/ Caulking Cartridge Dispensing Gun works with all standard...Industry-standard Dispenser for Dual-Barrel cartridgesKit Includes an integrated dual-ratio plunger, usable for both 1:1 and 2:1 ratio cartridges$101.34
- Vicrez®Dual Epoxy/Caulking Cartridge Dispensing Gun (vzt101)Universal Dual Epoxy/Caulking Cartridge Dispensing Gun (vzt101) by Vicrez®. Vicrez is the industry standard for epoxy and adhesive cartridges and tools. The Vicrez Dual Epoxy/ Caulking Cartridge Dispensing Gun works with all standard...Industry-standard Dispenser for Dual-Barrel cartridgesKit Includes an integrated dual-ratio plunger, usable for both 1:1 and 2:1 ratio cartridges$47.67
- Vicrez®Dual Cartridge Static Mixing Nozzle (vzt103)Universal Dual Cartridge Static Mixing Nozzle (vzt103) by Vicrez®. Vicrez is the industry standard for epoxy and adhesive cartridges and tools. And specifically, cartridges from Vicrez, Loctite, Araldite, Devcon, and 3M, and many...Perfect for consistently applying Epoxy and Adhesives for any applicationIndustry-standard Dispenser for Dual-Barrel cartridges$20.26
- Vicrez®Dual Cartridge Static Mixing Nozzle (vzt104)Universal Dual Cartridge Static Mixing Nozzle (vzt104) by Vicrez®. Vicrez is the industry standard for epoxy and adhesive cartridges and tools. And specifically, cartridges from Vicrez, Loctite, Araldite, Devcon, and 3M, and many...Perfect for consistently applying Epoxy and Adhesives for any applicationIndustry-standard Dispenser for Dual-Barrel cartridges$29.79
- Vicrez®Dual Cartridge Static Mixing Nozzle (vzt105)Universal Dual Cartridge Static Mixing Nozzle (vzt105) by Vicrez®. Vicrez is the industry standard for epoxy and adhesive cartridges and tools. And specifically, cartridges from Vicrez, Loctite, Araldite, Devcon, and 3M, and many...Perfect for consistently applying Epoxy and Adhesives for any applicationIndustry-standard Dispenser for Dual-Barrel cartridges$41.72
- Vicrez®BL Style Rear Diffuser (vz102490)BL Style Rear Diffuser by Vicrez®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...Precision injection molded for an OEM fit and great ease of installationGuaranteed Fitment$463.83
- Vicrez®C5 Centa VR2 Style Carbon Flash Metallic Rear Diffuser (vz102630-CFZ)C5 Centa VR2 Style Rear Diffuser (vz102630-CFZ) by Vicrez®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Precision injection molded for an OEM fit and great ease of installationGuaranteed Fitment$643.75
- Vicrez®C5 Centa VR2 Style Gloss Black Rear Diffuser (vz102630-GB)C5 Centa VR2 Style Rear Diffuser (vz102630-GB) by Vicrez®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured...Precision injection molded for an OEM fit and great ease of installationGuaranteed Fitment$559.20
- Vicrez®C5 Centa VR2 Style Matte Black Rear Diffuser (vz102630-MB)C5 Centa VR2 Style Rear Diffuser (vz102630-MB) by Vicrez®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured...Precision injection molded for an OEM fit and great ease of installationGuaranteed Fitment$546.10
- Vicrez®C5 Centa VR2 Style Rear Diffuser (vz102630-FC)C5 Centa VR2 Style Rear Diffuser (vz102630-FC) by Vicrez®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured...Precision injection molded for an OEM fit and great ease of installationGuaranteed Fitment$654.48
When constructing a race car, no matter whether it’s a purpose built track machine or a modified production vehicle, car builders try to achieve an aerodynamic balance between drag and downforce. Minimizing drag reduces the air resistance encountered by the car, allowing it to go faster. Downforce is necessary so the tires stay firmly planted on the track surface for optimal power delivery, steering and braking. Diffusers, air dams and side skirts combine to increase down force on race cars. If you want to make your machine look like it’s ready for the track, check out our selection of diffusers.
Although some body mods increase drag to create downforce, this tradeoff is necessary for overall vehicle performance. However, there are component choices a builder can make that maximize downforce without creating excessive drag. Such is the case with a rear diffuser. When combined with an air dam and side skirts, a rear diffuser functions to increase the velocity of the air flowing underneath the car and increase downforce and traction at the tires.
According to Bernoulli’s Principle, when the velocity of air increases, its pressure decreases. This means that the air pressure above the car is greater, and this greater pressure exerted downward provides the necessary downforce. Although components like rear wings can also be used to provide downforce, they create much more aerodynamic drag while doing so than a rear diffuser. The diffuser provides the space for the high velocity, low pressure air flow to decelerate and expand at the rear of the vehicle, creating a pressure differential and more downforce. Diffusers also typically have dividers that allow the air flow to transition to the airstream at the back of the car without creating turbulence and drag.
Of course, the above description applies mainly to a car constructed expressly for racing. Such cars usually have smoother undercarriages to facilitate the increased air flow velocity, and they are driven at much higher speeds than are allowable on the highway, so the average street driven car will not realize all of a diffuser’s benefits. But we know that the visual appeal of a custom rear diffuser and aerodynamic body components in general is just as, if not more important to street driven car owners than functionality, which is why we have the extensive selection of diffusers you see on the page before you.
We offer rear diffusers for most popular cars in materials including carbon fiber, aluminum, urethane, fiberglass, fiberglass composite, ABS plastic and stainless steel. Depending on application, some are designed to be a fully custom addition, while others are replacements for the OE diffuser but are manufactured in an upgraded material like carbon fiber. Some applications are designed to be used with specific exhaust systems. And because each of our rear diffusers is carefully designed for a specific model, regardless of your choice you can count on ease of fitment, and an appearance that will command attention and perfectly complement your vehicle’s styling.