yes I know/understand a true tuned pipe will give the most power increase, I was thinking of getting the 3268, but (as I said) I have found that just an increase of 300 RPMs make a noticeable difference in how my plane pulls off the ground and in top speed,, so if I could find a one-piece bolt on muffler that would give me an increase of 500 RPMs that would get my motor up to 7700 with the 3W 20x8,, that would be quite significant..

Jim