2013-2016 B8.5 Audi A4/S4 - CAP Carbon Fiber Rear Vertical LED Diffuser - V4

Carbon Fiber Rear Diffuser V4 – Vertical LED | For 2013–2016 Audi A4 S-Line / S4 (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 A4/S4.

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.