ECS Tuning H-Pipe replaces the resonators on the RS4. Only other modification to the car is a K&N air filter. Exhaust valves are open (vacuum lines tied) to mimic Sport button.714 views | 0 comments Click here to watch the video (01:19) Submitted By: nyanom Tags: Audi RS4 Exhaust ECS Tuning H-Pipe Sound&…