Doug, I'm still building it. I might send the Slimline muffler back, I designed my own here at work . It takes up even less space and I'm going to test it first for RPM's against the factory muff. If it works, great. I'll post a photo tonight. You might be impressed with it. I'll be doing the cowl and wheel pants this weekend along with the little stuff to finish. This plane will work but for some reason I think this will be just "another" plane. Hope I'm wrong. Seeya later, MM