Well, my 21st birthday is coming up, so i'm looking to get myself some Borla Stingers. Any one know where I can get just the stinger mufflers, not in a catback? I think the catback is out of the price range... but I love the sound with the prochamber. Will the sound change at all coming through the stock 2 1/4" piping as opposed to a 2 1/2"? Thanks guys.