ECS Audi RS4 H-Pipe
Here's a "sound" investment that will give your Audi RS4 a voice worth listening to. The ECS H-Pipe replaces the OE resonator, producing a great outside exhaust note that won't drone you out of the interior.
As an added bonus, the dyno tells us you'll get an extra free 3-5 hp at 6000-8000 rpm. The H-pipe won't interfere with flapper valves in the rear mufflers.
Installation is a cut and clamp affair. Cut out the old resonator; clamp in the H-pipe.
Limited lifetime warranty to the original purchaser.