Rear Diffusers
- Duraflex®Raptor Style Fiberglass Rear Diffuser (Unpainted) (114521)Raptor 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$53.55$79.00Save $25.45 (32%)
- Duraflex®Rega Style Fiberglass Rear Diffuser (Unpainted) (118443)Rega 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$257.55$379.00Save $121.45 (32%)
- Duraflex®Rover Style Fiberglass Rear Diffuser (Unpainted) (117954)Rover 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$98.60$145.00Save $46.40 (32%)
- Duraflex®S-Line Style Fiberglass Rear Diffuser (Unpainted) (119681)S-Line Style Rear Diffuser (119681) 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$80.75$119.00Save $38.25 (32%)
- Duraflex®S-Line Style Fiberglass Rear Diffuser (Unpainted) (114210)S-Line Style Rear Diffuser (114210) 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$82.45$122.00Save $39.55 (32%)
- Duraflex®SBZ Style Fiberglass Rear Diffuser (Unpainted) (117005)SBZ 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$109.65$162.00Save $52.35 (32%)
- Duraflex®SM-G Style Fiberglass Rear Diffuser (Unpainted) (113379)SM-G 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$135.15$199.00Save $63.85 (32%)
- Duraflex®SP-N Style Fiberglass Rear Diffuser (Unpainted) (108333)SP-N 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$254.15$374.00Save $119.85 (32%)
- Duraflex®SQR Style Fiberglass Rear Diffuser (Unpainted) (118068)SQR 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$87.55$129.00Save $41.45 (32%)
- Duraflex®SRK Style Fiberglass Rear Diffuser (Unpainted) (116337)SRK 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$135.15$199.00Save $63.85 (32%)
- Duraflex®Sceptre Style Fiberglass Rear Diffuser (Unpainted) (118038)Sceptre 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$475.15$699.00Save $223.85 (32%)
- Duraflex®Shark Style Fiberglass Rear Diffuser (Unpainted) (116707)Shark 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$126.65$187.00Save $60.35 (32%)
- Duraflex®Sika Style Fiberglass Rear Diffuser (Unpainted) (118017)Sika 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$128.35$189.00Save $60.65 (32%)
- Duraflex®Silkstreak Style Fiberglass Rear Diffuser (Unpainted) (118283)Silkstreak 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$173.40$256.00Save $82.60 (32%)
- Duraflex®Soar Style Fiberglass Rear Diffuser (Unpainted) (118063)Soar 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$257.55$379.00Save $121.45 (32%)
- Duraflex®Speed Tune Style Fiberglass Rear Diffuser (Unpainted) (118061)Speed Tune 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$147.90$218.00Save $70.10 (32%)
- Duraflex®Speedster Style Fiberglass Rear Diffuser (Unpainted) (114301)Speedster 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$260.95$384.00Save $123.05 (32%)
- Duraflex®Street Rio Style Fiberglass Rear Diffuser (Unpainted) (118084)Street Rio 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$339.15$499.00Save $159.85 (32%)
- Duraflex®Super Fin Style Fiberglass Rear Diffuser (Unpainted) (114366)Super Fin 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$136.00$201.00Save $65.00 (32%)
- Duraflex®T2 Style Fiberglass Rear Diffuser (Unpainted) (117926)T2 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$261.80$386.00Save $124.20 (32%)
- Duraflex®TD3000 Style V2 Fiberglass Rear Diffuser (Unpainted) (116664)TD3000 Style V2 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$202.30$298.00Save $95.70 (32%)
- Duraflex®TKO Boss Style Fiberglass Wide Body Rear Diffuser (Unpainted) (114869)TKO Boss Style Wide Body 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....Designed to elevate your vehicle’s style above the restManufactured using proprietary polymer blend$289.00$426.00Save $137.00 (32%)
- Duraflex®TS-1 Style Fiberglass Rear Diffuser (Unpainted) (112782)TS-1 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®TS1 Style Fiberglass Rear Diffuser (Unpainted) (117010)TS1 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$323.85$477.00Save $153.15 (32%)
- Duraflex®TZ Style Fiberglass Rear Diffuser (Unpainted) (112799)TZ 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$288.15$424.00Save $135.85 (32%)
- Duraflex®Taka Style Fiberglass Rear Diffuser (Unpainted) (118141)Taka 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$300.05$442.00Save $141.95 (32%)
- Duraflex®Taka Style Fiberglass Rear Diffuser (Unpainted) (117363)Taka 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$271.15$399.00Save $127.85 (32%)
- Duraflex®Tando Style Fiberglass Rear Diffuser (Unpainted) (117793)Tando 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$85.00$125.00Save $40.00 (32%)
- Duraflex®Twins Style Fiberglass Rear Diffuser (Unpainted) (117966)Twins 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$249.90$368.00Save $118.10 (32%)
- Duraflex®Unplugged Style Fiberglass Rear Diffuser (Unpainted) (119170)Unplugged 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$226.10$333.00Save $106.90 (32%)
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.