Audi S4 B8 Sedan FRP Rear Bumper Diffuser, 2009–2012 Pre-Facelift

FRP Rear Bumper Diffuser for Audi S4 B8 Sedan

Update the lower rear bumper of your pre-facelift S4 with this FRP diffuser. The source describes a replacement for the factory plastic diffuser, not a complete rear bumper or exhaust assembly.

Vehicle fitment

• Audi S4 B8 Sedan, 4-door.
• Pre-facelift models, 2009–2012.
• Not for Audi A4 B8 Base or S line models.

Confirm your exact model year, bumper revision, original diffuser and exhaust outlet layout before ordering. Avant, facelift models, other years and modified bumpers are not established applications. The year alone does not confirm the required pre-facelift bumper.

Material and finish options

• FRP: fiber-reinforced plastic.
• Glossy Black FRP: glossy black option.
• Matte Black FRP: matte black option.

Select the desired Color option before purchase. This is an FRP product, not a carbon-fiber diffuser. The source does not specify a reinforcement weave or UV-protection coating system.

Installation

Self-tapping screws are listed as included. The source describes replacement of the factory diffuser and states that cutting or modification is not required. However, the supplied screw description does not establish that every installation can use existing holes. Confirm the mounting arrangement and whether drilling is necessary before making permanent changes.

Professional installation is recommended. Remove the original diffuser as required, test-fit the replacement and check alignment, exhaust clearance and mounting points before final fastening. Do not force installation if the bumper or fastening profile does not match.

Package details

The listing describes a replacement rear diffuser and self-tapping screws. Exact piece count, dimensions, exhaust-opening measurements and screw quantities are not specified; confirm package contents before installation. Exhaust components are not listed as included.

Frequently asked questions

Does it fit an A4 S line?
No. The source explicitly excludes both A4 Base and A4 S line models.

Is the matte option carbon fiber?
No. Both listed finish options are FRP.

Is it a replacement or an overlay?
The source identifies it as a replacement for the factory diffuser.

Is drilling required?
The source claims no modification but also lists self-tapping screws. Confirm the actual fastening method rather than assuming a no-drill installation.

Does it improve aerodynamic performance?
No measured aerodynamic, handling or fuel-economy results are supplied, so those effects are not promised.