i agree. i installed the smaller muffler, 4x8x16, to make it a little louder. absolutley no resonance and it sounds mean as hell. it wasnt too expensive. i paid $400 for the cat back and another $120 for the additioner muffler to replace the standard one. cant wait to throw some longtubes on there and an ORY. mine comes out right infront of the rear tire. i had it coming out after the tire with the standard 5x10x24 and still had no resonance. go with bassani.