2017–2019 Audi A4 S-Line / S4 B9 Sedan Front Bumper Fins – Carbon Fiber

Add a sharper, more track-inspired front-end detail to your Audi A4 B9 S-Line or S4 Sedan with these carbon fiber front bumper fins. Supplied as a handed pair, they trim the lower front corner intake and vent areas with a deep gloss black carbon weave finish for added visual width and aggression.

Build

• Material: Genuine carbon fiber, autoclave cured using a 3D design and CNC moulding process for precise fin geometry, consistent panel quality, and an authentic weave appearance over carbon-look ABS or fiberglass alternatives
• Surface finish: High-gloss epoxy-polished finish in gloss black carbon that showcases the natural weave with strong resistance to UV exposure, moisture, and road debris
• Configuration: Supplied as a handed pair (left and right) for a symmetrical installation across both lower front corners
• Weight: Lightweight carbon construction adds negligible weight to the front of the vehicle

Design & Finish

• Sharper front face: Fin trim around the lower intake and vent areas adds detail and visual width to the front corners
• Aggressive stance: Enhances the factory bumper's venting areas for a sharper, more purposeful front-end appearance
• Carbon aesthetic: Directional weave and gloss black 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 front 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

• 2 × carbon fiber front bumper fins (left and right)
• Pre-applied adhesive tape for installation

Installation

• No-drill, adhesive-mounted: Installs with the included adhesive tape — no drilling and no permanent modification to the factory front bumper
• Surface prep: Thoroughly clean, degrease, and dry the bumper at each fin position before fitting to ensure maximum adhesion
• Check orientation: The fins are handed — confirm correct left and right sides before final adhesion
• Professional installation recommended for the best positioning, panel alignment, and finish

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
• Dry-fit both fins and check symmetry against a fixed reference point on each side before adhesion — paired front-corner parts show any imbalance clearly
• Fins sit low on the bumper and are exposed to road debris and kerbs — take care when parking nose-in
• Installation is reversible, but adhesive removal and re-prep may be required if pieces need repositioning