Carbon Fiber Rear Bumper Diffuser for 2008–2011 Audi A4 B8 Base Sedan
Designed for selected 2008–2011 Audi A4 B8 Sedan models, this carbon fiber rear bumper diffuser replaces the factory lower rear diffuser and gives the pre-facelift B8 rear bumper a more defined carbon fiber appearance.
This product is specifically intended for compatible A4 B8 Base Sedan rear bumper configurations. It is not intended for Audi A4 S line or Audi S4 rear bumpers, which use different lower bumper designs.
Vehicle Fitment
Vehicle: Audi A4
Generation: B8 Pre-Facelift
Model Years: 2008–2011
Body Style: Sedan 4-Door
Product Type: Rear Bumper Diffuser
Based on the current fitment list, this rear diffuser is intended for selected 2008–2011 Audi A4 Sedan configurations, including listed Base, Sport, Luxury and Trendy Plus trims.
Because rear bumper specifications can vary by trim and market, compare your rear bumper with the product images or send us your model year and clear rear bumper photos before ordering.
Carbon Fiber Construction
The diffuser is produced with 3x3 woven carbon fiber and finished with a gloss UV-protected clear coating. The exposed carbon weave complements other carbon fiber exterior upgrades while adding a more distinctive lower rear profile to the A4 B8 Base Sedan.
The protective clear finish is intended to help preserve the visible carbon surface and gloss appearance during normal exterior use.
Replacement-Style Rear Diffuser
This is a replacement-style rear bumper diffuser designed to take the place of the factory lower diffuser rather than install over it as a simple add-on lip.
The product is intended primarily as an exterior styling upgrade. No specific downforce, drag reduction or handling improvement is claimed without product-specific aerodynamic testing.
Installation
Installation requires removal of the original lower rear diffuser before fitting the carbon fiber replacement. Self-tapping screws are included according to the current product specification.
Test-fit the diffuser before final installation and confirm that the mounting areas, bumper edges and exhaust openings align correctly. Professional installation is recommended if you are unfamiliar with rear bumper trim removal or panel alignment.
Confirm Fitment Before Ordering
This product is specifically positioned for the 2008–2011 Audi A4 B8 Base Sedan. It should not be selected based only on the Audi A4 model name, as A4 S line, S4 and later B8.5 rear bumper designs use different diffuser shapes.
Explore More Audi A4 / S4 B8 Parts
Browse more 2008–2011 Audi A4 / S4 B8 parts, explore the complete Audi A4 / S4 collection, or view our full Audi parts collection.
