2008–2012 Audi A4 S-Line / S4 B8 Sedan Wide Scoop Rear Valance Diffuser – Carbon Fiber

Upgrade the lower rear profile of your Audi A4 B8 S-Line or S4 Sedan with this carbon fiber rear valance diffuser. Its bold wide-scoop profile goes beyond a conventional diffuser to create a more assertive lower rear appearance, spanning 142.7 cm across the bumper with a genuine carbon weave finish.

Build

• Material: Genuine carbon fiber, autoclave cured using a 3D design and CNC moulding process for precise valance geometry, consistent panel quality, and an authentic weave appearance over carbon-look ABS or fiberglass alternatives
• Surface finish: High-gloss epoxy-polished and UV-protected finish that showcases the natural carbon weave and resists UV exposure, moisture, and surface degradation through sustained outdoor and driving exposure
• Configuration: Single-piece full-width rear valance for the lower rear bumper
• Panel width & weight: 142.7 cm across · approximately 1.25 kg

Design & Aerodynamics

• Wide scoop profile: Bold scooped shape creates a more distinctive, assertive lower rear appearance than a conventional flat diffuser
• Aggressive stance: Full-width valance adds visual weight to the lower rear for a more planted, track-inspired rear end
• Carbon aesthetic: Directional weave and gloss finish complement the sporty S-Line and S4 bodywork for a coordinated, motorsport-grade look

Fitment

• 2008–2012 Audi A4 S-Line B8 Sedan (4-door)
• 2008–2012 Audi S4 B8 Sedan (4-door)
• Fits the A4 S-Line and S4 factory rear bumper only — not compatible with the standard non-S-Line A4 or aftermarket bumper configurations
• Body style: Sedan only — not confirmed for Avant or Allroad body styles

Package Contents

• 1 × carbon fiber rear valance diffuser
• Adhesive tape for installation
• Mounting screws for installation

Installation

• Two mounting options: Fit with the included adhesive tape for a cleaner finish, or with the included screws for a more permanent, secure fitment
• Surface prep: If using adhesive tape, thoroughly clean, degrease, and dry the rear bumper before fitting to ensure maximum adhesion
• Alignment: Dry-fit and check the valance sits centred and even across the bumper before committing to either method
• Professional installation recommended for correct valance positioning, panel alignment, and a clean finish — particularly if using the screw-mount option

Before You Install

• Confirm your car is an A4 S-Line or S4 B8 Sedan (2008–2012) before ordering — this will not fit the standard non-S-Line A4
• Screw mounting is permanent — it requires drilling into the bumper, so decide on your method and confirm placement before starting
• Take care when parking rear-in — full-width lower rear panels sit close to kerbs and parking blocks
• Adhesive installation is reversible, but removal and re-prep may be required if the valance needs repositioning