Triple R Composites Audi RS5 B9 Set of 2 Additional OEM Diffuser Fins
Give your Audi RS5 B9 a sharper, more focused rear end with this set of 2 additional diffuser fins. These fins copy the style and shape of the factory (OEM) pieces already on the bumper, so the upgrade looks like it left the factory that way.
Diffuser fins help guide the air as it leaves the back of the car. This can steady airflow and reduce drag a little at higher speeds, as well as giving the rear bumper a more purposeful look.
- Matches the original Audi RS5 B9 diffuser fin design
- Adds a more aggressive, motorsport inspired rear end
- Nylon 12 construction for strength and impact resistance
- Media blasted and supplied in black for a clean OEM style finish
- Paintable by any good body shop if you want to colour code
- Supplied with stainless steel fitting kit for a secure install
Material and finish
Each fin is manufactured from durable nylon 12, a high quality plastic that is tough yet light. The parts are media blasted to give a smooth, even surface, then finished in black. This gives a subtle factory look, or you can have them painted to match your bodywork or contrast trim.
Fitment and compatibility
This kit is designed specifically for Audi RS5 B9 Sportback and Coupe models from 2017-2019. It works with the standard rear diffuser and aligns with the existing styling lines on the bumper.
Please check your car is an RS5 B9 Sportback (2017-2019) with the appropriate rear bumper before ordering.
Use the vehicle lookup on our site or check the Vehicle Fitment tab for full details before ordering.
Triple R Composites UK Authorised Installer & Distributor.





