Look for an inverted pitts muffler for a 2-stroke engine. I have run several 2 strokes upside down. Only pain is trying to start it, but with an electric starter its no problem. Here's a pic of my 80 in mustang with a moki 210 2-stroke, with the inverted pitts muffler. The cylinder head hangs a little out the bottom, and the exhaust hangs out the bottom. I would highly suggest not mounting the engine sideways KILLS the scale looks. By the way if you wish you could cut down the exhaust ports flush, I may do that this year to increase scale appearance.