Audi A4 2.Ot Downpipe
Rai Motorsport MSRP: from $450
RAI Motorsport recently announced one of the only 3'' downpipes for the B7 A4 2.0T. It's available for either manual or auto transmissions and can be bought with or without a 300-cell high-flow cat.
Constructed from T304 stainless steel, it actually uses 3.5'' diameter tubing from the turbo to the cat, then 3'' after the cat. It's designed to remove the bottleneck in the factory system and will even connect to the factory slip-fitting using a machined reducer. All downpipes come with a lifetime warranty.