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Replacement Diffusers

Product Image Product Name Price Buy Now
APR Fiber Glass Rear Diffuser Ford Mustang GT 10-12 APR Fiber Glass Rear Diffuser Ford Mustang GT 10-12  $597.00  $507.45  Buy Now
APR Fiberglass Rear Diffuser Ford Mustang S197 05-09 APR Fiberglass Rear Diffuser Ford Mustang S197 05-09  $574.00  $487.90  Buy Now
APR FRP Rear Diffuser Honda S2000 AP2 04-09 APR FRP Rear Diffuser Honda S2000 AP2 04-09  $574.00  $487.90  Buy Now
APR FRP Rear Diffuser Subaru WRX STI 02-07 APR FRP Rear Diffuser Subaru WRX STI 02-07  $574.00  $487.90  Buy Now
APR Performance Carbon Fiber 2pc Rear Diffuser with Undertray Chevrolet Corvette C7 Z51 Stingray 14-15 APR Performance Carbon Fiber 2pc Rear Diffuser with Undertray Chevrolet Corvette C7 Z51 Stingray 14-15  $1,965.00  $1,670.25  Buy Now
APR Performance Carbon Fiber Diffuser Undertray Chevrolet Corvette C7 14-15 APR Performance Carbon Fiber Diffuser Undertray Chevrolet Corvette C7 14-15  $475.00  $403.75  Buy Now
APR Performance Carbon Fiber Rear Diffuser Dodge Viper SRT-10 Roadster 03-10 APR Performance Carbon Fiber Rear Diffuser Dodge Viper SRT-10 Roadster 03-10  $1,885.00  $1,602.25  Buy Now
APR Performance Carbon Fiber Rear Diffuser Porsche 991 GT3 14-16 APR Performance Carbon Fiber Rear Diffuser Porsche 991 GT3 14-16  $1,500.00  $1,275.00  Buy Now
APR Performance Carbon Fiber Rear Diffuser with Undertray Chevrolet Corvette C7/C7 Z06 14-15 APR Performance Carbon Fiber Rear Diffuser with Undertray Chevrolet Corvette C7/C7 Z06 14-15  $1,965.00  $1,670.25  Buy Now
APR Performance Carbon Fiber Rear Diffuser without Undertray Chevrolet Corvette C7 Z51 Stingray 14-15 APR Performance Carbon Fiber Rear Diffuser without Undertray Chevrolet Corvette C7 Z51 Stingray 14-15  $1,540.00  $1,309.00  Buy Now
APR Performance Carbon Fiber Rear Diffuser without Undertray Chevrolet Corvette C7/C7 Z06 14-15 APR Performance Carbon Fiber Rear Diffuser without Undertray Chevrolet Corvette C7/C7 Z06 14-15  $1,540.00  $1,309.00  Buy Now
APR Performance Carbon Fiber Rear Valance Scion FRS 13-14 APR Performance Carbon Fiber Rear Valance Scion FRS 13-14  $720.00  $612.00  Buy Now
APR Performance Carbon Fiber Rear Valance Subaru BRZ 13-14 APR Performance Carbon Fiber Rear Valance Subaru BRZ 13-14  $720.00  $612.00  Buy Now
APR Performance Diffuser Porsche 718 Cayman GT4 2017 APR Performance Diffuser Porsche 718 Cayman GT4 2017  $1,925.00  Buy Now
APR Performance Diffuser Porsche 981 Cayman GT4 15-16 APR Performance Diffuser Porsche 981 Cayman GT4 15-16  $1,925.00  Buy Now
APR Performance Fiber Reinforced Plastic Rear Diffuser Honda S2000 00-03 APR Performance Fiber Reinforced Plastic Rear Diffuser Honda S2000 00-03  $574.00  $487.90  Buy Now
ARK C-FX Carbon Quad Tip Diffuser Hyundai Veloster NA Model Only 12-14 ARK C-FX Carbon Quad Tip Diffuser Hyundai Veloster NA Model Only 12-14  $695.00  $590.75  Buy Now
ARK C-FX Rear Diffuser Carbon Fiber Hyundai Genesis Coupe 10-13 ARK C-FX Rear Diffuser Carbon Fiber Hyundai Genesis Coupe 10-13  $969.00  $823.65  Buy Now
ARK S-FX Carbon Fiber Rear Diffuser V2 Hyundai Genesis Coupe 10-16 ARK S-FX Carbon Fiber Rear Diffuser V2 Hyundai Genesis Coupe 10-16  $929.00  $789.65  Buy Now
Arkym Aerosport Double Side Carbon Rear Diff. Convertible BMW M3 E93 08-13 Arkym Aerosport Double Side Carbon Rear Diff. Convertible BMW M3 E93 08-13  $1,149.00  Buy Now
Arkym Aerosport Double Side Carbon Rear Diff. Coupe BMW M3 E92 08-14 Arkym Aerosport Double Side Carbon Rear Diff. Coupe BMW M3 E92 08-14  $1,149.00  Buy Now
Arkym Aerosport Double Side Carbon Rear Diff. Coupe BMW Z4 E86 09-13 Arkym Aerosport Double Side Carbon Rear Diff. Coupe BMW Z4 E86 09-13  $1,199.00  Buy Now
Arkym Aerosport Double Side Carbon Rear Diff. Roadster BMW Z4 E85 03-08 Arkym Aerosport Double Side Carbon Rear Diff. Roadster BMW Z4 E85 03-08  $1,199.00  Buy Now
Arkym Aerosport Double Side Carbon Rear Diff. Sedan BMW M3 E90 08-13 Arkym Aerosport Double Side Carbon Rear Diff. Sedan BMW M3 E90 08-13  $1,149.00  Buy Now
Arkym Aerosport Single Side Carbon Rear Diff. Convertible BMW 335i E93 06-11 Arkym Aerosport Single Side Carbon Rear Diff. Convertible BMW 335i E93 06-11  $899.00  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.

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