What is considered low RPM's? The trailtech is registering 1500-3000rpm's when I get the most noise. Anything higher and the noise goes away. Could be all my fault and my damn tall 15/40 gearing making the jump between gears HUGE. that is some TALL TALL gearing there i bet you can run for like 2 minutes between shifts LOL With your 10.5-1 have you tried maybe a mix of fuel like 20/80 race/premium to see how that affects it?