Stock exhaust, go straight to 3" stainless or do U bend delete first?

leave the stock cat back then and get headers.

you will not really get any noticeable gains from a cat back on these cars. They flow fine up to 350whp which is a huge supercharged build.

!!!! READ !!!! before you help this member, read this, he's a waste of time.... http://www.grandprixforums.net/f37/4...wtf-24599.html

Is this thread serious? Catback's do nothing for performance. Get a Downpipe if your broke.

I like 4 doors.

might as well go full 4". step it up one more time after the downpipe so you can have something really worthwhile.