Sorry about your noise problem, but I have a couple of those engines and the tower muffler is noisy! I use that muffler on OS, Magnums and others that it will fit and it really boost power, similar to a Nelson short pipe, but at a noise premium. If you put a different muffler on the engine, it will not have that awesome power, but will be quieter. The magnum .46 and .52 mufflers will bolt right up to the tower, are the same specs as an OS .46/.50 muffler, but less costly. The Tower engines are a great buy at $75.00 each, but the OS's, Magnums, Thunder Tigers are quieter. The SuperTigre .52 is one of the quietest and less expensive of them all. You may want to try it and sell your Tower to some of the hot rodders or sport flyers where noise is not as much an issue.