madman75 said: Another thing that seems to help is a more free flowing muffler. I used the stock muffler with some of the guts removed. I put a single 1/2" id outlet which may not be enough to get the most performance.
I'm also using a stock muffler with a single 1/2" outlet pipe. I just cut a bigger hole in the can where the original outlet was and stuck a piece of 1/2" EMT about a third of the way into the can and welded it. I'd like to try modifying the stock muffler with a bigger outlet pipe and also gutting the can. I've heard a couple of times about "gutted" stock mufflers. HOW ARE YOU DOING THIS? In order to gut the muffler don't you have to cut it open? Do you cut it along the seams, or maybe cut the top off? That means some not too easy butt edge welding, or somehow shrinking one side and expanding the other so the halves slide together, or making a band to braise over the edge of the two halves in order to put it back together.
diceco