From the horses mouth at DA today "All tests were made with the standard side mount mufflers on new, non-broken in engines at 2700' ASL. With very accurate tachs".

I'm sure daveham heard the same thing today.

I'll wait to see what the prop/muffler change will do . . ."a 24 x 8 Menz Standard (6400) on a 19.5 lb. 88" Cap won the first IMAC contest entered."

If you want the RPM drop down to the 22 x 8 Menz Standard (7300). I'll take constant speed, and smooth power any day.

BigRagu