I was curious also if the Tower muffler was better than the stock OS muffler also. Buddy of mine had one on his plane and I asked if it made a difference on the power. He said he really didn't know since he did not TAC it before it was put on. So we cranked my engine up with stock muffler and put TAC on it to see what it was running. We then took the stock muffler off and put the Tower Muffler on it to see the difference. It did work and make a difference, I cant remember what rpm's it was at but I know it was like a 800-1000 rpm difference. It was a while back when we tried it out. So after that I went ahead and ordered me the Tower pipe.

You cant beat the price at $14.99 and don't think the charged shipping since it was a Tower product.

http://www2.towerhobbies.com/cgi-bin...?&I=LXCLH6&P=7