Precision Fitment
Each part is 3D-scanned against the platform and digitally modelled before tooling — so fitment is engineered, not approximated.
Audi A5 / S5 B9 Carbon Fibre Rear Diffuser 2017+
£399.00
ASM Sports Tech offers a precision-crafted diffuser made of high-quality carbon fibre, tailored to fit the Audi A5/S5 B9.
Specialist online — replies in minutes
Speak to ASM before you order
Straight answers on fitment, lead time and build direction — direct from the team that engineers it.
Open WhatsApp LineDoubt removed
before commitment
Every component leaves on one standard: measured fitment, disciplined materials, and a specialist on the line before and after you order. The proof sits below — not the promise.
Composite Construction
Pre-preg carbon and lightweight composite, finished to a consistent standard and built for structural intent — not cosmetic weight.
Support, Both Sides of the Sale
A specialist answers fitment, lead time and compatibility before you order — and stays reachable after it ships.
Transform the rear profile of your Audi A5 or S5 B9 (2017 and newer) with the ASM Sports Tech Carbon Fibre Rear Diffuser, precision-engineered for enhanced aerodynamics and an aggressive OEM+ finish.
Constructed from carbon fibre, this diffuser offers maximum strength with minimal weight. Its aerodynamic fin structure improves airflow under the rear bumper, increasing stability and performance at higher speeds while delivering a motorsport-inspired aesthetic.
Compatible Models:
- 2017-2021 Audi A5 S-LINE B9
- 2017-2021 Audi S5 B9
Key Features:
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Carbon Fibre Construction – For superior strength and lightweight design.
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OEM Fitment – 3D-scanned for precise bumper alignment and plug-and-play installation.
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Gloss UV Finish – mirror-gloss protection against UV rays and road debris.
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Aerodynamic Performance – optimized airflow for stability and reduced drag.
Enhance the rear aesthetics and aerodynamic profile of your Audi A5 or S5 B9 2017+ with the ASM Sports Tech Carbon Fibre Rear Diffuser, combining luxury craftsmanship, functional design, and flawless OEM precision.
The questions
worth asking first
Fitment, installation, materials, lead time and support — the answers that settle the last doubts before you order. Anything not covered, the specialist line is one tap away.
Fitment is defined by the product title, the listed application scope and your platform. If you're unsure, open the WhatsApp line and a specialist will confirm the correct application before you order.
Yes — particularly for carbon aero, exhaust components and platform-specific upgrades, where alignment, finish protection and correct hardware positioning matter to the result.
It depends on the part, but the standard is consistent: disciplined finish, clean visual consistency and resolved platform-specific presentation. Pre-preg carbon and lightweight composite where the application calls for it.
It depends on whether the part is in stock or built to order. The estimated timeline on the product page is the reference to use before checkout — and the specialist line can confirm it for your exact spec.
Yes. For fitment, visual direction, material choice or build planning, use the WhatsApp block on this page and a specialist will guide you before you place the order.
Yes — worldwide shipping is available across most ASM Sports Tech lines. Method and transit time vary by product category, destination and dispatch origin.
Two ways
to order
Order directly with ASM Sports Tech, or through an authorised partner in your region. Same components, same standard — whichever route fits the build.
Regional Access
Prefer a local point of contact? An authorised ASM partner in your region can handle the order end to end.
Project-Based Ordering
Multi-part builds and full upgrade directions are best coordinated as one order — we'll plan it with you before placement.
Direct or Dealer
Order direct from ASM or through a partner — the parts, the fitment standard and the support are identical either way.
// ASM Sports Tech — The Programme
Complete the build
Matching components for the same platform — selected to fit alongside what you're ordering and finish the build as one resolved direction.
