this is the set up i have on my '03. This is 2 1/2'' cat back to a Y pipe and i have 2 off brand single wrap mufflers set up for chamber noise and i also have no resonator. Love the sound its loud yet classy
Stock gtp catback, you'll like it alot if you like quite yet still a lil growl to it. Anything aftermarket will make your car sound like ass with tons of rasp, I don't care what anyone says. I had on my modded GS a stock gtp set up without a cat or res, I had zero rasp whats so ever. Then I heard some cars with the same or more mods with flow masters or magnaflows that just sounded like pure crap and raspy as all hell. I plan on going with a gtp set up on my Impala as soon as I find one.