Originally posted by westcoaststyle
Bolt on systems are supposedly "tuned" for performance, but I just have a welded setup. 1 or 2 extra hp isn't worth the $$ to me. 
I know right. So-called "tuned" or "performance tuned" exhausts are a load of bologna. Find a nice universal muffler, some resonators, and a highflow cat, and have an exhaust shop do it up with some nice mandrel bent pipe. it would be so much cheaper then springing for a cat-back exhaust, and the performance difference is negligable.
on the other hand, if you have a ton of money then go for the Apex'i or HKS cat-backs or whatever.
just my personal opinion though