haha...i also had this same problem, and i tried flowmasters, dynomax, glasspacks, and everything i could think of. Honestly, for me the best sound was nothing at all. I have pacesetter headers and y-pipe, and a magnaflow direct fit cat.converter. I ran it with nothing attached to the cat.converter, and it sounded great, but after adding a small straight pipe and turndown in front of the rear pass. wheel, it did make it a little more quiet, but still sounded great. Also, the pipe i used was the same diamiter as the cat...i think 2.5 or 3"...but that is on my 88 2.9 v-6