ORIGINAL: CRFan1

I got my Pitts style muffler from Valley View RC for 59 bucks...fits and works perfect with the only difference being you cannot route the spark plug lead bewteen the down tubes (which I wouldn't do anyway). I went around to the left (as you look at the plane). Sounds good and no issues with it.

http://www.valleyviewrc.com/estore/a...-mufflers.html