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.
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YouTube | February 18, 2008
Tags:. .YouTube. .ecs. .resonators. .vacuum. .valves
Audi Button Ecs Exhaust Filter Mimic Resonators Vacuum Valves YouTube