this has nothing to do w/ the currant argument, but is true and interesting. when I built my 92 GMC street truck w/ a really hot 406 sbc, 1 7/8" headers, 350 turbo, 3:73 rear, w/ a leaflink type traction devises, and a Detroit locker, I drove it for a while w/ my home made 3" straight back to 3" dual flowmasters on it. then took it to a muffler shop and had 3" duals running back over the axle and out behind the rear wheels added. I could tell the h.p. diff. when I started it and backed out of the muffler shop. It was so drastic compared to my home made system, I drove the 5 miles to my house and pulled them off. reinstalled my turn downs on the mufflers. If some one needs or wants the 3" over the axle set up for a gm short bed, I`ll sell them dirt cheap, their still in the barn !! :coffee2: