I think the guy is asking for info on where to take his car to a shop that'll remove the resonator {{{{EDIT: I just noticed that you didn't want to replace the resonator}}}} and put a glasspack or something like that on. If you went with a larger pipe, you'd probably have to remove the muffler all together *if you weren't going to mess with upgrading that*. I'm no exhaust expert, but you maybe asking for a whole cat-back to notice that little extra HP boost you're seeking. That backed with a good intake.
