The ECS Tuning Rear Diffuser is the perfect way to give your Audi S4 an aggressive exterior styling upgrade. Made from your choice of black plastic or high-quality carbon fiber, the diffuser gives your car a look that is sure to turn heads. With its bold, yet factory like, design and superior performance, the ECS Tuning Rear Diffuser is the perfect way to take your Audi S4 to the next level.

ECS Tuning Diffuser (Plastic) - https://bit.ly/ecss4b9diffuser
ECS Tuning Diffuser (Carbon) - https://bit.ly/ecss4b9carbondiff
3M 5952 VHB Tape - https://amzn.to/3CrMbnu
TEKTON Screwdrivers - https://amzn.to/3LY82pR

Links above include ECS Tuning and Amazon affiliate links. As an Amazon Associate I earn from qualifying purchases.

When it comes to installing a diffuser, the last thing you want is a headache. With the ECS Tuning Diffuser, there's no need to drill or cut - simply bolt it on and you're done! The diffuser mounts to your car's factory mounting locations, so it's easy to install and takes minutes not hours. Plus, the ECS Tuning Diffuser is made from high-quality ABS plastic or carbon fiber, so it's built to last.

I went with a carbon fiber version of the ECS Tuning Rear Diffuser and had it painted black to match. It appears to have more aggressive styling than the black plastic version. The fitment was great, and the quality is top notch. I would recommend this product to anyone looking for a stylish rear valance.