I cut off 3/4 inch and got a solid 200rpm increase to 9100rpm on a 17/6 MAS wood, it was 8900 before the pipe cut. I think I'll stop now she has more than enough power for the 120 lite stick. This plane is just plain fun ....it will do any trick in the book and close to the ground to boot..........Powering out of trouble is noooo problem. Still have not touch the needles for power.

Just waiting on a 18/6 Mejzlik