2017–2019 Audi A4 S-Line / S4 B9 Sedan Sport Rear Bumper Lip – Carbon Fiber

Sharpen the lower rear profile of your Audi A4 B9 S-Line or S4 Sedan with this carbon fiber sport rear bumper lip. Spanning 135 cm across the lower bumper, it adds width and a more aggressive lower rear appearance with a UV-protected gloss carbon finish for a more planted, performance-oriented rear stance.

Build

• Material: Genuine carbon fiber, autoclave cured using a 3D design and CNC moulding process for precise lip 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 use
• Configuration: Single-piece lip for the lower rear bumper
• Panel width & weight: 135 cm across · approximately 1.55 kg

Design & Finish

• Aggressive stance: Lip profile adds width and visual weight to the lower rear for a more planted, track-inspired rear end
• Full-width coverage: The 135 cm span covers the lower rear bumper for clean, consistent coverage with no exposed factory sections
• Carbon aesthetic: Directional weave and gloss finish complement the sporty S-Line and S4 bodywork for a coordinated, motorsport-grade look

Fitment

• 2017–2019 Audi A4 S-Line B9 Sedan (4-door)
• 2017–2019 Audi S4 B9 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 sport rear bumper lip
• Adhesive tape for installation
• Mounting screws for installation

Installation

• Two mounting options: Fit with the included adhesive tape for a reversible install, 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 lip sits centred and even across the bumper before committing to either method
• Professional installation recommended for correct lip 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 B9 Sedan (2017–2019) 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 — lower rear panels sit close to kerbs and parking blocks
• Adhesive installation is reversible, but removal and re-prep may be required if the lip needs repositioning