Alright I have scanned through other threads and have not really come up with a straight answer. If I was to buy the RB street header or road race header, could I take off pre cat and hook it up to the main cat or would it not be long enough?..If someone could give me a straight answer that would be great.......

 

The street header is single outlet, but it needs a short extension pipe added to connect to the stock main cat. It is intended to bolt up the the RB pre-silencer, which is longer than the stock cat.

The road race header is dual outlet and is intended for full dual exhaust. A full dual setup will have 2 cats (or pre-silencers) and no collectors or Y's.