I will be needing a new muffler for my 02 kj in the next few months, and have been drooling over the flowmaster 50 series. I think the best fit would be the 50 suv, but I am curious, if I decided to get something like the 50 big block, or even the 70 big block, would that work? I am looking for a very aggressive sound, something that will make me stand out from the grocery kj next to me. Would a very big muffler like the 70 big block cause any problems? Also, since I am dealing in the exhaust area, I am looking for a new air filter, something that allows MUCH more air flow, whats a good option (keep in mind, I'm not looking for a whole new intake kit, money is a factor)... So?