Rear Diffusers
- Duraflex®VIP Style Fiberglass Rear Diffuser (Unpainted) (114328)VIP Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$67.15$99.00Save $31.85 (32%)
- Duraflex®VR-S Style Fiberglass Rear Diffuser (Unpainted) (113560)VR-S Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$305.15$449.00Save $143.85 (32%)
- Duraflex®VRS Style Fiberglass Rear Diffuser (Unpainted) (116615)VRS Style Rear Diffuser (116615) by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$432.65$637.00Save $204.35 (32%)
- Duraflex®VRS Style Fiberglass Rear Diffuser (Unpainted) (113471)VRS Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$197.20$291.00Save $93.80 (32%)
- Duraflex®VT Style Fiberglass Rear Diffuser (Unpainted) (113696)VT Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$179.35$264.00Save $84.65 (32%)
- Duraflex®VTX Style Fiberglass Rear Diffuser (Unpainted) (116613)VTX Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$427.55$629.00Save $201.45 (32%)
- Duraflex®VTX Style Fiberglass Rear Diffuser (Unpainted) (116123)VTX Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$162.35$239.00Save $76.65 (32%)
- Duraflex®VTX Style Fiberglass Rear Diffuser (Unpainted) (114277)VTX Style Rear Diffuser (114277) by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$245.65$362.00Save $116.35 (32%)
- Duraflex®Velocity Style Fiberglass Rear Diffuser (Unpainted) (117806)Velocity Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$268.60$395.00Save $126.40 (32%)
- Duraflex®Verella Style Fiberglass Rear Diffuser (Unpainted) (119140)Verella Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$407.15$599.00Save $191.85 (32%)
- Duraflex®Versus Style Fiberglass Rear Diffuser (Unpainted) (118877)Versus Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$169.15$249.00Save $79.85 (32%)
- Duraflex®Waterman Style Fiberglass Rear Diffuser (Unpainted) (117812)Waterman Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$142.80$210.00Save $67.20 (32%)
- Duraflex®Wave Style Fiberglass Rear Diffuser (Unpainted) (119085)Wave Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$339.15$499.00Save $159.85 (32%)
- Duraflex®Werks Style Fiberglass Rear Diffuser (Unpainted) (118148)Werks Style Rear Diffuser (118148) by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$190.40$281.00Save $90.60 (32%)
- Duraflex®Z1 Speed Style Fiberglass Rear Diffuser (Unpainted) (117922)Z1 Speed Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$85.00$125.00Save $40.00 (32%)
- Duraflex®ZL1 Style Fiberglass Rear Diffuser (Unpainted) (119705)ZL1 Style Rear Diffuser (119705) by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$71.40$106.00Save $34.60 (33%)
- Duraflex®ZL1 Style Fiberglass Rear Diffuser (Unpainted) (114494)ZL1 Style Rear Diffuser (114494) by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$73.95$109.00Save $35.05 (32%)
- Duraflex®ZR Edition Style Fiberglass Rear Diffuser (Unpainted) (105699)ZR Edition Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$305.15$449.00Save $143.85 (32%)
- Duraflex®Zenith Style Fiberglass Rear Diffuser (Unpainted) (118109)Zenith Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$407.15$599.00Save $191.85 (32%)
- Duraflex®Zeta Style Fiberglass Rear Diffuser (Unpainted) (115074)Zeta Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$200.60$295.00Save $94.40 (32%)
- Duraflex®Zex Style Fiberglass Rear Diffuser (Unpainted) (117759)Zex Style Rear Diffuser by Duraflex®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, it'll decrease the pressure under the car with a resulting increase in downforce. Increased downforce...Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$339.15$499.00Save $159.85 (32%)
- Carbon Creations®3DS Style Carbon Fiber Rear Diffuser (116992)3DS Style Rear Diffuser by Carbon Creations®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, the rear diffuser will decrease the pressure under the car with a resulting increase in...Hand-laid carbon fiber part on top of fiberglass2x2 twill weave carbon fiber$181.80$253.00Save $71.20 (28%)
- Carbon Creations®A Spec Style Carbon Fiber Rear Diffuser (115775)A Spec Style Rear Diffuser by Carbon Creations®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, the rear diffuser will decrease the pressure under the car with a resulting increase in...Hand-laid carbon fiber part on top of fiberglass2x2 twill weave carbon fiber$387.00$538.00Save $151.00 (28%)
- Carbon Creations®AG Design Style Carbon Fiber Rear Diffuser (116971)AG Design Style Rear Diffuser by Carbon Creations®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, the rear diffuser will decrease the pressure under the car with a resulting increase in...Hand-laid carbon fiber part on top of fiberglass2x2 twill weave carbon fiber$495.00$688.00Save $193.00 (28%)
- Carbon Creations®AK-M Style DriTech Carbon Fiber Rear Diffuser (114518)AK-M Style Rear Diffuser by Carbon Creations®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, the rear diffuser will decrease the pressure under the car with a resulting increase in...Hand-laid carbon fiber part on top of fiberglass2x2 twill weave carbon fiber$603.90$839.00Save $235.10 (28%)
- Carbon Creations®AM Design Style Carbon Fiber Rear Diffuser (112999)AM Design Style Rear Diffuser by Carbon Creations®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, the rear diffuser will decrease the pressure under the car with a resulting increase in...Hand-laid carbon fiber part on top of fiberglass2x2 twill weave carbon fiber$503.10$699.00Save $195.90 (28%)
- Carbon Creations®AMK Style Carbon Fiber Rear Diffuser (113484)AMK Style Rear Diffuser by Carbon Creations®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, the rear diffuser will decrease the pressure under the car with a resulting increase in...Hand-laid carbon fiber part on top of fiberglass2x2 twill weave carbon fiber$284.40$395.00Save $110.60 (28%)
- Carbon Creations®AXS Style Carbon Fiber Rear Diffuser (117062)AXS Style Rear Diffuser by Carbon Creations®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, the rear diffuser will decrease the pressure under the car with a resulting increase in...Hand-laid carbon fiber part on top of fiberglass2x2 twill weave carbon fiber$385.20$536.00Save $150.80 (28%)
- Carbon Creations®Agent Style Carbon Fiber Rear Diffuser (115618)Agent Style Rear Diffuser by Carbon Creations®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, the rear diffuser will decrease the pressure under the car with a resulting increase in...Hand-laid carbon fiber part on top of fiberglass2x2 twill weave carbon fiber$252.00$351.00Save $99.00 (28%)
- Carbon Creations®AutoBahn Style DriTech Carbon Fiber Rear Diffuser (114211)AutoBahn Style Rear Diffuser by Carbon Creations®. Accelerate the velocity of the airflow underneath your car with this Rear Diffuser. At speed, the rear diffuser will decrease the pressure under the car with a resulting increase in...Hand-laid carbon fiber part on top of fiberglass2x2 twill weave carbon fiber$262.80$366.00Save $103.20 (28%)
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.