I was trying to figure which engine would be faster in the Bobcat.
I have a YS 45, and would use a quiet pipe on it.
The other set -up would be the OS 55AX, on some type of pipe.
I have only run the YS 45 on the stock muffler, so wouldn't know their potential. I think I would like to set up the YS 45 for a pretty good up line. It shouldn't be too much trouble to re tune the pipe for a smaller diameter bigger pitch prop for when you really want to get top speed.
Either way I have to throw some $$$$ at it. I keep telling myself, it is only a hobby.

Greg