2020–2021 Audi A5 S-Line / S5 B9 Sportback Rear Bumper Diffuser Lip – Carbon Fiber
2020–2021 Audi A5 S-Line / S5 B9 Sportback Rear Bumper Diffuser Lip – Carbon Fiber
Complete the rear-end transformation of your Audi A5 S-Line or S5 B9 Sportback with this carbon fiber rear bumper diffuser lip. Supplied as a two-piece set spanning the full lower bumper width, it adds visual width and a more aggressive lower rear appearance with a genuine carbon weave finish.
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: High-gloss epoxy-polished top coat that showcases the natural carbon weave and provides lasting UV and moisture protection through sustained outdoor and driving exposure
- Configuration: Two-piece set for complete lower rear bumper coverage
- Panel width & weight: 173.8 cm across · approximately 1.65 kg for the set
Design & Aerodynamics
- Aggressive stance: Diffuser lip profile adds visual width and weight to the lower rear for a more commanding, track-inspired rear end
- Full-width coverage: The 173.8 cm span covers the complete lower rear bumper for an integrated finish with no exposed factory sections
- Carbon aesthetic: Directional weave and gloss finish complement the factory B9 Sportback bodywork for a coordinated, motorsport-grade look
Fitment
- 2020–2021 Audi A5 S-Line B9 Sportback (4-door)
- 2020–2021 Audi S5 B9 Sportback (4-door)
- Fits the factory rear bumper only — not compatible with aftermarket bumper configurations
- Body style: Sportback (4-door) only — does not fit Coupe, Sedan, or Cabriolet body configurations
Package Contents
- 2 × carbon fiber rear bumper diffuser lip pieces
- 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 rear bumper
- Surface prep: Thoroughly clean, degrease, and dry the rear bumper at all mounting positions before fitting to ensure maximum adhesion
- Alignment: Dry-fit both pieces together and check spacing and symmetry across the full width before committing either to adhesion
- Professional installation strongly recommended — a panel of this width requires careful positioning to achieve symmetrical alignment and a clean finish
Before You Install
- Confirm your car is an A5 S-Line or S5 B9 Sportback (2020–2021) before ordering — this will not fit the Coupe, Sedan, or Cabriolet
- Work in moderate temperatures and allow the adhesive to cure fully before washing the car
- Installation is reversible, but adhesive removal and re-prep may be required if pieces need repositioning
Ships within 1-2 business days.
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2020–2021 Audi A5 S-Line / S5 B9 Sportback Rear Bumper Diffuser Lip – Carbon Fiber
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FAQs
Please read our FAQs page to find out more.
Are OEM products more expensive than aftermarket alternatives?
OEM products might have a higher upfront cost compared to aftermarket parts, but their superior quality and durability often make them a more cost-effective choice over time. Investing in OEM ensures you’re getting parts specifically designed for your vehicle, which can lead to better performance and longevity.
Can I purchase OEM parts online or do I need to visit a dealership?
You don’t need to visit a dealership to get OEM parts. You can conveniently purchase genuine OEM components from authorized distributors and reputable online retailers like Turbo Tech Performance. Our online store provides a wide selection of high-quality parts delivered straight to your door.
Are parts from brands like Mopar, ACDelco, and Motorcraft interchangeable between different vehicle brands?
No, parts from Mopar, ACDelco, and Motorcraft are typically designed for specific vehicle brands. It’s crucial to ensure compatibility with your vehicle’s make and model by checking part numbers and consulting with a knowledgeable expert.
Can I install OEM parts myself, or is it better to have a professional handle it?
While some OEM parts can be installed by DIY enthusiasts, the complexity of installation can vary. For the best results and to ensure proper fitment and performance, we recommend having a trained mechanic install the parts, especially if you’re unfamiliar with automotive repairs.
Do OEM parts come with a warranty?
Yes, many OEM auto parts come with a manufacturer’s warranty that covers defects or issues. Be sure to check the warranty details for each part at the time of purchase, and keep your receipt for any potential warranty claims.