I just ripped out my exhaust. It was all cobbed to hell. Reducers every where A clamps holding everything up. It was a flowmaster exhaust. The kid before me cut the cat off and put a straight pipe and it hurts me to see how cobbed it is. The damn thing must have leaked everywhere. I am wondering what is the stock size exhaust pipe from the cat to the muffler. I am wondering this because he had a reducer goin to the inlet and on both outlets. Should it be just a direct fit?

 

By "reducer", I assume you mean the muffler flange was bigger than the pipe. If so, that's good.

You're in the perfect position to make that exhaust better than it ever was before. If there's still anything factory attached to the heads even, get rid of it, too. The LG4 exhaust stinks to high heaven, and anybody who told you the stock size so you could duplicate it would be doing you a disservice.

Get headers made for '86-up TPI with y-pipe. It will have a connection to a 3" slip-fit cat. Then get a direct-fit cat and I-pipe for the same application. It will have a bolt-type flange on the cat outlet, and 3" back to the muffler. At that point, if your muffler inlet is less than 3" but more than 2-1/2", a reducer isn't going to hurt you that much. The tailpipes should be 2-1/4" or 2-1/2".

If you can't afford headers & y-pipe, at least get LB9/L69/L98 exhaust manifolds and go from there (I just happen to have an LB9 set available...).

 

^^^ this is all a good idea, and shouldn't cost a whole lot. ^^^