2009–2012 Audi S4 B8 Sedan FRP Rear Bumper Diffuser

Product specifications

FRP Rear Bumper Diffuser for 2009–2012 Audi S4 B8 Sedan

Gloss Black or Matte Black FRP

The diffuser is available in Gloss Black FRP and Matte Black FRP options. FRP provides an alternative to exposed carbon fiber for owners who want a black rear diffuser finish while keeping the S4 B8 rear bumper styling clearly defined.

Choose the finish according to the appearance of your vehicle and other exterior trim. Gloss black creates a more reflective finish, while matte black provides a more understated look.

Replacement-Style Rear Diffuser

This is a replacement-style rear bumper diffuser designed to take the place of the factory lower diffuser rather than simply attach over the original part.

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 FRP replacement. Test-fit the product before final installation and confirm that the mounting points, bumper edges and exhaust openings align correctly.

Professional installation is recommended if you are unfamiliar with rear bumper trim removal or panel alignment.