I keep waiting for the final solution on this thread, but it doesn't really sound like there is going to be one definative anwser.
I am running the same engine in my Spf that I took out of my E-Morrison, and the loss of power is really noticeable. I can't stand it any more, and ready to make a change just not sure what. I really only want to do this once. Where is anyone sourcing the different muffler choices?