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It varies by year as well. Mine is 2.5" with the mid pipe to the cat, muffler and the tail pipe. Also by having header and removing the cat really changes the sound. LIke ALOT!I dont think they have the rabate anymore. i got mine summer of last year but i would not buy one i put it on my truck and it sounded like crap. I have the 4.0 and i even had headers and no cat on it and it still sounded like crap and i cant not wait to rip it off and put a flowmaster on it. plus mine did not come with the pipe that goes from the cat to the muffler and mine was about shot. so all i got was a muffler and a tailpipe.