See here is the deal. My car came with a catback and I have no dea what kind of brand it is (I have been told spintech). I'm loooking to upgrade to something louder and while the Loudmouth is well loud their are two things I don't like about the Loudmouth. I do not like the way it sounds at idle or the rasp it tends to produce once you lose the cats. However since the Borla is adjustible I might just go with that. Their to expensive for me new but it seems you can pick one up fairly cheap used.