That has to be the worst comeback ever...and how am I still wrong...your post says absolutely nothing. And if you know anything about these cars in the first place you should know the catback is the LEAST restrictive part of the exhaust system. U-Bend is first and then the downpipe. You WANT a 3" Downpipe on these cars...if our using a 2.5" DP and modding your car anywhere past a couple bolt-ons...you should be going 3". As for the manifold porting...is it better than stock? Yes. Is it worth taking off and porting? Not really. That "sound" you got in the exhaust was from the DP, not porting the manifold. If you think you got more sound out of the car by taking some casting off of a piece manifold...YOUR wrong.