Flowmaster cat back ?\'s on 3/4 ton Burb I plan to replace the exhaust on my Burb in the near future and was planning a high flow cat and a Flowmaster cat back single 3" system. It is pretty much what I have on my K5. Anyhow I spoke with Flowmaster today but got no real answers. What I have is an 87 3/4 ton 2wd Burb with a tbi454 and looking on Flowmasters site they only list a 3" cat back for a 88 to 91 3/4 ton Burb with a 5.7 (350) engine. Does anybody know if this will work on my 87 big block? Looking at the pic on the Flowmaster site it looks like it will work and the muffler is the 50 series big block muffler which the guy at Flowmaster reccommended to me if I was going to have the pipe bent. I know a single 3" system is plenty for a stock big block and have no intentionsof buying duels for it.