BME Xtreme update
Diablo, I haven't tested the Menz 27x10 but a MCS 27x10 which is a heavier load is turning 6300-6400. The Mejzlik 28x10 is turning 6700 and a 26x10 menz is turning 7100. This is on stock mufflers and and a new non broken-in engine. This engine is designed for tuned exhaust with a exhaust port duration of 170 degrees.
Keith