1QWK beat me to it. Do Not waste the money on a pitts muffler. You will hate it because it will run like crap. They all do. The Jett is the best. Period. That being said, I seem to remember a Blue Jett muffler for sale at Hangar 9? Dub never made a blue one (His are color coded to rpm), but this one was a true Jett for around $45. Look around. Scrounge for used, buy a junk engine with a decent muffler. If I had one the correct size I would send it to you. Good luck.

Scott