01-17-2007, 10:34 PM
the downpipe should bolt right up to the 2nd cat, which will lead into his exhaust. IIRC, the stock NA header has a split with two primary cats (3 pipes to each), which join together just before the secondary cat. This means Thayer is also going to eliminate some cats/restriction. Personally, I'd get a high-flow cat or a test pipe at this point, since the cat is now going to be the restriction on his exhaust flow, which we all know is critical to a turbo.