Diffusers

12 products

12 products
Akrapovic Rear Carbon Fiber Diffuser - Porsche 911 Turbo 991.2 (Gloss)
Akrapovic Rear Carbon Fiber Diffuser - Porsche 911 Turbo 991.2 (Gloss)
Akrapovic
Akrapovic Rear Carbon Fiber Diffuser - BMW M5 G90 (Gloss)
Akrapovic Rear Carbon Fiber Diffuser - BMW M5 G90 (Gloss)
Akrapovic
ON SALE
Seibon Carbon Fiber Rear Diffuser Cover - Subaru BRZ Toyota 86
Seibon Carbon Fiber Rear Diffuser Cover - Subaru BRZ Toyota 86
Seibon
ON SALE
Seibon MB-Style Carbon Fiber Rear Diffuser - Honda Civic Type R FL5
Seibon MB-Style Carbon Fiber Rear Diffuser - Honda Civic Type R FL5
Seibon
ON SALE
Seibon Carbon Fiber Rear Diffuser Cover - Toyota GR86 Subaru BRZ
Seibon Carbon Fiber Rear Diffuser Cover - Toyota GR86 Subaru BRZ
Seibon
ON SALE
Seibon MB-Style Carbon Fiber Rear Diffuser - Subaru WRX VB
Seibon MB-Style Carbon Fiber Rear Diffuser - Subaru WRX VB
Seibon
ON SALE
Seibon MB-Style Carbon Fiber Rear Diffuser - Nissan Z
Seibon MB-Style Carbon Fiber Rear Diffuser - Nissan Z
Seibon
ON SALE
Seibon MB-Style Carbon Fiber Rear Diffuser - Toyota GR Supra
Seibon MB-Style Carbon Fiber Rear Diffuser - Toyota GR Supra
Seibon
ON SALE
Seibon Carbon Fiber Rear Diffuser - Toyota GR Supra
Seibon Carbon Fiber Rear Diffuser - Toyota GR Supra
Seibon
ON SALE
Seibon Carbon Fiber Rear Diffuser - BMW E46 M3
Seibon Carbon Fiber Rear Diffuser - BMW E46 M3
Seibon
ON SALE
Seibon Carbon Fiber Rear Diffuser - Tesla Model 3
Seibon Carbon Fiber Rear Diffuser - Tesla Model 3
Seibon
Akrapovic Rear Carbon Fiber Diffuser - BMW X5M F95 X6M F96 (Gloss)
Akrapovic Rear Carbon Fiber Diffuser - BMW X5M F95 X6M F96 (Gloss)
Akrapovic

Rear Diffusers & Underbody Aero

Rear diffusers manage airflow underneath the vehicle, accelerating it through expanding channels to create a low-pressure zone that generates rear downforce and reduces aerodynamic drag. Functional diffusers improve high-speed stability and reduce lift, while aggressive diffuser designs add a race-inspired look to the rear of the vehicle.

OneFastShop carries rear diffusers including bolt-on rear diffusers, OE-style diffuser replacements, carbon fiber diffusers, underbody aero panels, diffuser fins, and direct-fit applications for sports cars, muscle cars, and performance platforms with flat or near-flat underbodies.

Every diffuser at OneFastShop ships brand-new with manufacturer warranty coverage. Whether you're adding functional downforce for the track, replacing a damaged factory diffuser, or finishing an aero package with an aggressive rear end, OneFastShop has the diffuser. Shop the full diffusers collection today.
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