2021–2023 Audi A3 S-Line / S3 8Y Sedan Rear Bumper Diffuser – Carbon Fiber

Transform the rear end of your Audi S3 8Y or A3 S-Line Sedan with this carbon fiber rear bumper diffuser. Spanning 139 cm across the lower bumper, it adds width and a more aggressive lower rear profile that visually lowers the stance for a more purposeful, performance-oriented rear appearance.

Build

• Material: Genuine carbon fiber, autoclave cured using a 3D design and CNC milling process for precise diffuser geometry, consistent panel quality, and an authentic weave appearance over carbon-look ABS or fiberglass alternatives
• Surface finish: Polished and UV-protected finish that holds its deep gloss carbon weave appearance through sustained outdoor and driving exposure without fading or yellowing
• Configuration: Single-piece diffuser for the lower rear bumper
• Panel width & weight: 139 cm across · approximately 1.15 kg

Design & Aerodynamics

• Aggressive stance: Diffuser profile adds width and visual weight to the lower rear for a more planted, track-inspired rear end
• Full-width coverage: The 139 cm span covers the lower rear bumper for an integrated, finished rear-end upgrade
• Carbon aesthetic: Directional weave and gloss finish complement the factory 8Y bodywork for a coordinated, motorsport-grade look

Fitment

• 2021–2023 Audi S3 8Y Sedan (4-door)
• 2021–2023 Audi A3 S-Line 8Y Sedan (4-door)
• Fits the factory rear bumper only — not compatible with aftermarket or non-8Y bumper configurations
• Body style: Sedan only — not confirmed for Sportback variants
• Check your rear bumper shape against the product images before ordering — bumper detailing differs between trim levels

Package Contents

• 1 × carbon fiber rear bumper diffuser
• Self-tapping screws for installation

Installation

• Screw-mounted: Secures with the included self-tapping screws for a secure, rattle-free fit — no adhesive tape required
• Drilling required: Self-tapping screws pierce the bumper, so this is a permanent modification rather than a reversible fit
• Surface prep: Clean and degrease the rear bumper at the fixing locations before installation
• Professional installation recommended for correct diffuser positioning, panel alignment, and a clean finish

Before You Install

• This is a permanent, screw-mounted fitment — dry-fit and confirm placement carefully before driving any screws
• Confirm your car is an 8Y Sedan before ordering — fitment is not confirmed for the Sportback
• Verify your trim level and rear bumper shape against the product images before ordering
• Take care when parking rear-in — lower rear panels sit close to kerbs and parking blocks