To continue adding to Jim's data. Mine is running on a speed plane. I get 17,450 with a 10x8 on break in fuel. 15.5% nitro, 22% oil and the balance methanol. Mine has the 10mm carb and is pumped. I run a custom carbon fiber tuned pipe since I can not justify the weight of the 50400 pipe, even though it performs very well. This thing is a powerhouse and likes to rev. With over 180 exhaust timing it is not very happy under 15k.