Ok, here's a problem that i encountered when i bought my 1985 suburban. The guy that had it before me obviously didnt take very good care of it. One side of the exhaust was coming out before the muffler and the other side wasnt and it ran like shCensoredt! Do the 6.2s need a set amount of back pressure to run correctly, because i patched the system togeter again and it runs like a top the mufflers are falling apart.:grd: