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Replacement Diffusers

Product Image Product Name Price Buy Now
Auto Craft Rear Under | Diffuser 02 FRP Mazda RX-7 FD3S 93-02 Auto Craft Rear Under | Diffuser 02 FRP Mazda RX-7 FD3S 93-02  $767.44  Buy Now
Auto Craft Rear Under | Diffuser 02 Type B - Carbon Mazda RX-7 FD3S 93-02 Auto Craft Rear Under | Diffuser 02 Type B - Carbon Mazda RX-7 FD3S 93-02  $964.22  Buy Now
Auto Craft Rear Under | Diffuser 03 FRP Mazda RX-7 FD3S 93-02 Auto Craft Rear Under | Diffuser 03 FRP Mazda RX-7 FD3S 93-02  $1,279.06  Buy Now
Auto Craft Rear Under | Diffuser 03 Type B - Carbon Mazda RX-7 FD3S 93-02 Auto Craft Rear Under | Diffuser 03 Type B - Carbon Mazda RX-7 FD3S 93-02  $1,692.30  Buy Now
Auto Tecknic Vacuumed Carbon Fiber Competition Center Diffuser BMW F10 M5 12-16 Auto Tecknic Vacuumed Carbon Fiber Competition Center Diffuser BMW F10 M5 12-16  $540.00  Buy Now
Auto Tecknic Vacuumed Carbon Fiber Diffuser BMW F80 M3 15-18 Auto Tecknic Vacuumed Carbon Fiber Diffuser BMW F80 M3 15-18  $680.00  Buy Now
Auto Tecknic Vacuumed Carbon Fiber Diffuser BMW F82 M4 15-18 Auto Tecknic Vacuumed Carbon Fiber Diffuser BMW F82 M4 15-18  $680.00  Buy Now
AutoExe Rear Under | Diffuser 01 Mazda 04-11 AutoExe Rear Under | Diffuser 01 Mazda 04-11  $767.79  Buy Now
AutoExe Rear Under | Diffuser 01 Mazda 2 08-13 AutoExe Rear Under | Diffuser 01 Mazda 2 08-13  $330.78  Buy Now
AutoExe Rear Under | Diffuser 01 Mazda 6 03-08 AutoExe Rear Under | Diffuser 01 Mazda 6 03-08  $621.01  Buy Now
AutoExe Rear Under | Diffuser 01 Mazda 6 09-13 AutoExe Rear Under | Diffuser 01 Mazda 6 09-13  $429.07  Buy Now
AutoExe Rear Under | Diffuser 02 Mazda 04-11 AutoExe Rear Under | Diffuser 02 Mazda 04-11  $429.07  Buy Now
AutoExe Rear Under | Diffuser 02 Mazda 6 09-13 AutoExe Rear Under | Diffuser 02 Mazda 6 09-13  $429.07  Buy Now
AutoExe Rear Under | Diffuser 03 Mazda 04-11 AutoExe Rear Under | Diffuser 03 Mazda 04-11  $429.07  Buy Now
AWE Tuning B8.5 A5 Dual Outlet Bumper Conversion Kit Audi A5 S-Line 10-17 AWE Tuning B8.5 A5 Dual Outlet Bumper Conversion Kit Audi A5 S-Line 10-17  $646.95  $595.00  Buy Now
AWE Tuning Carbon Fiber Quad Tip Rear Diffuser Audi A4 2.0T B8 Non-S-Line AWE Tuning Carbon Fiber Quad Tip Rear Diffuser Audi A4 2.0T B8 Non-S-Line  $320.95  $295.00  Buy Now
AWE Tuning Carbon Fiber Quad Tip Rear Diffuser Conversion Kit Audi A4 2.0T B8 Non-S-Line AWE Tuning Carbon Fiber Quad Tip Rear Diffuser Conversion Kit Audi A4 2.0T B8 Non-S-Line  $537.95  $495.00  Buy Now
BMW Performance Carbon Fiber Rear Diffuser BMW 1 Series 08-11 BMW Performance Carbon Fiber Rear Diffuser BMW 1 Series 08-11  $1,769.00  Buy Now
Borla Aerodynamic Exhaust Diffuser BMW 1M 3.0L 11-12 Borla Aerodynamic Exhaust Diffuser BMW 1M 3.0L 11-12  $485.99  $433.99  Buy Now
Brabus Carbon Fiber Gloss Rear Diffusor Mercedes Benz S63 AMG 14-15 Brabus Carbon Fiber Gloss Rear Diffusor Mercedes Benz S63 AMG 14-15  $5,995.00  Buy Now
Brabus Carbon Fiber Gloss Rear Diffusor Mercedes Benz S65 AMG 14-15 Brabus Carbon Fiber Gloss Rear Diffusor Mercedes Benz S65 AMG 14-15  $5,995.00  Buy Now
Brabus Gloss Carbon Fiber Rear Diffuser Mercedes-Benz C63 S AMG 15-17 Brabus Gloss Carbon Fiber Rear Diffuser Mercedes-Benz C63 S AMG 15-17  $4,195.00  Buy Now
Brabus Gloss Carbon Fiber Rear Diffuser Mercedes-Benz GT | GTS 15-18 Brabus Gloss Carbon Fiber Rear Diffuser Mercedes-Benz GT | GTS 15-18  $6,695.00  Buy Now
Brabus Gloss Carbon Fiber Rear Diffusor Mercedes Benz S63 AMG W222 15-16 Brabus Gloss Carbon Fiber Rear Diffusor Mercedes Benz S63 AMG W222 15-16  $6,095.00  Buy Now
Brabus Gloss Carbon Fiber Rear Diffusor Mercedes Benz S65 AMG W222 15-16 Brabus Gloss Carbon Fiber Rear Diffusor Mercedes Benz S65 AMG W222 15-16  $6,095.00  Buy Now
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In automotive terms, a diffuser is a shaped section of the car’s underbody, which improves the vehicle’s aerodynamic properties. This happens by enhancing the transition between the high-velocity airflow underneath the car and the freestream airflow of the ambient atmosphere. In simpler terms, the purpose of a rear diffuser is to reduce air turbulence as your car drives at high speeds.

By decreasing drag, rear diffusers make your car more stable at high speeds and reduce the amount of wind resistance it must overcome. Less wind resistance means that your vehicle will be able to utilize its existing horsepower and torque more efficiently. A rear diffuser also adds style to your car and helps it stand out from the crowd. If you have a rear wing on your car, it also affects the diffuser. When the rear wing is mounted low and close to the diffuser, the low pressure under the wing helps suck air through the diffuser.

As the front of a vehicle slows down the air without a diffuser, this is the ideal place to install an inlet. A splitter is commonly used and serves to increase the amount of downforce (lift inverted) at the front of the car. The airstream is brought to stagnation above the splitter by an air dam, which results in an area of high pressure. Below the splitter, the air is redirected away from the stagnation zone and accelerated, causing the pressure to drop. The decrease in pressure in combination with the high pressure over the splitter area creates downforce. Consequently, the larger the area of the splitter, the more downforce is generated.

Buy online or call us today to place your order! If you don't see what you're looking for, please contact us at 1-480-966-3040. We can help you find the right product for your vehicle to fit both your taste and your needs. 

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