Collection: Audi Rear Diffuser

Rear diffusers for Audi, from RS-style conversions to carbon fiber replacements. Diffuser fitment depends on two things at once - the chassis and the bumper type - so each listing states both before the product grid.

Find your chassis

Common starting points: Q5/SQ5 B9 (2019-2021), Q5/SQ5 B9.5 (2022-2025), A5/S5 B9 (2017-2019), A5/S5 B9.5 (2020-2024) and A4/S4 B9 (2017-2019).

Exhaust and bumper compatibility

Single-side, dual-side and quad exhaust layouts need different cut-outs, and S-Line or RS bumpers accept diffusers that will not fit a standard bumper. Decide whether you are replacing the valance only or the whole lower bumper section before ordering - the two are not interchangeable.

Read the B8.5 S4/S5 exterior upgrade guide for exhaust clearance notes, or browse the full rear diffuser range for BMW and Audi and the Audi parts catalogue.