I have a .61 OS FX and the muffler that comes with it. Now I need to install it on a P-51D Mustang. I found that if I turn the engine at a certain position, then I could hide the muffler in cowl leaving only the small end tube out. The engine would be in a 30 degree up side down position. I'm a beginner and not so sure if this will be all right or not.