2017–2019 Audi A5 S-Line / S5 B9 Coupe & Sportback S5 Style Rear Bumper Diffuser – Carbon Fiber
SHIPPING - RETURNS - WARRANTY - CANCELLATION POLICY
*** Market Conditions after 2020 have changed the landscape of automotive parts. Although we try to stock 1000's of items in our multiple warehouse and use multiple distribution channels, having back-orders are unavoidable in today's market. If you are in need of a product quickly, we suggest email, message, or call us for availability so that we may explore your options.
Email: Sales@Speedzoneweb.com
Call: 407-846-8430
Text: 407-749-6314
Frequently Asked Questions
2017–2019 Audi A5 S-Line / S5 B9 Coupe & Sportback S5 Style Rear Bumper Diffuser – Carbon Fiber
Upgrade the lower rear profile of your Audi A5 S-Line or S5 B9 with this carbon fiber rear bumper diffuser. Finished in deep gloss black carbon and spanning 150 cm across the lower bumper, the S5-style profile adds width and visual aggression for a more planted, performance-oriented rear stance.
Build
- Material: Genuine carbon fiber, manufactured to precise tolerances for consistent panel quality, high structural integrity, and an authentic weave appearance over carbon-look ABS or fiberglass alternatives
- Surface finish: Deep gloss black finish with a UV-resistant coating that showcases the natural carbon weave and resists UV exposure, moisture, and road debris through sustained outdoor and driving use
- Configuration: Single-piece diffuser for the lower rear bumper
- Panel width: 150 cm across
Design & Aerodynamics
- S5-style profile: Clean, factory-derived diffuser shape that brings the S5 rear-end look to the A5 S-Line
- Aggressive stance: Adds width and visual weight to the lower rear for a more planted, track-inspired rear end
- Carbon aesthetic: Directional weave and gloss black finish complement the factory B9 bodywork for a coordinated, motorsport-grade look
Fitment
- 2017–2019 Audi A5 S-Line B9 — Coupe (2-door) and Sportback (4-door)
- 2017–2019 Audi S5 B9 — Coupe (2-door) and Sportback (4-door)
- Fits the A5 S-Line and S5 factory rear bumper only — not compatible with the standard non-S-Line A5, aftermarket bumpers, or non-B9 configurations
- Confirm your body style before ordering — verify whether your car is the Coupe or Sportback and check the rear bumper configuration matches
Package Contents
- 1 × carbon fiber rear bumper diffuser
- Installation hardware
Installation
- Surface prep: Thoroughly clean and degrease the rear bumper before installation to ensure correct panel seating and secure fitment
- Alignment: Dry-fit and check the diffuser sits centred and even across the bumper, with consistent panel gaps on both sides, before final fitting
- Professional installation recommended for correct positioning, panel alignment, and finish quality given the 150 cm panel width
- Plan for a second pair of hands during fitting given the panel's span
Before You Install
- Confirm your car is an A5 S-Line or S5 B9 (2017–2019) before ordering — this will not fit the standard non-S-Line A5
- Verify your body style and rear bumper shape against the product images before ordering, as the Coupe and Sportback rear ends differ
- Take care when parking rear-in — full-width lower rear panels sit close to kerbs and parking blocks
Our History
For 26 years Speedzone Performance LLC has been providing aftermarket car parts to Central Floridians and 1000's of customers online. What makes us different than all the other places online? We have 3 actual brick and mortar locations where were serve customers daily and find new ways to provide support and assistance to the automotive community at large. From our in house SPDZ1 Brand, to our constantly growing in stock inventory, we strive to make our customer service and ease of purchase stand out from the rest! We are also one of the largest automotive part financing providers anywhere in the United States, and continue to provide more options for our customers every year. We love what we do, and it shows in every product we sell and every new customer who becomes a part of our Speedzone Family.