2013-2017 B8.5 Audi A5/S5 - CAP Carbon Fiber Rear Vertical LED Diffuser - V4

Please note, this is a pre-order item. The ETA for this carbon diffuser is approximately November 25, 2025. All pre-order sales are final and cannot be cancelled.

Carbon Fiber Rear Diffuser V4 – Vertical LED | For 2013–2017 Audi A5 S-Line / S5 (B8.5)

Introducing the highly anticipated V4 Carbon Fiber Diffuser, a 2025 release from Canadian Auto Performance — now featuring our signature vertical LED brake light. This updated version delivers refined styling and elevated performance looks, combining high-grade carbon fiber craftsmanship with bold, distinctive detail for the B8.5 Audi A5/S5.

Building on the success of our V1 and V2 models, the V3 takes styling and functionality to the next level. While the V1 diffuser featured a bold, aggressive look and the V2 offered a more refined, subtle design, the V4 strikes the perfect balance with enhanced contours and an integrated vertical LED brake light — a first in our diffuser lineup. Crafted from high-quality hand-laid carbon fiber, the V3 is engineered to stand out.

Wiring Instructions

Red is the live wire.
Black is the ground wire.
Yellow is the brake light wire.

IMPORTANT NOTE FOR INSTALLATION DISCLAIMER:

Professional install of this carbon diffuser by someone who has aftermarket product experience is required. Rear bumper is required to be removed to install this carbon fiber diffuser properly. Self tapping screws must be used in corners and/or tabs to keep diffuser secure.