I agree, that is the best 14.00 you can spend in this hobby if you have a 46. They also blot up to an irvine 53. The tower muffler gives my engine about 150 rpm more than the macs muffler. I don't know what the difference would be between the tuned pipe and the tower muffler. I just went to towers site and they won't be available until late Jul. Too bad since mine fell off the other day.