Thanks for the info, just ordered mine from amain on saturday, should have it by tomorrow, I already am running the WS7 III in my truggy, and a C6 in my buggy, with the throttle set at 75% pull, it's still new, not even a gallon on it, first time with the C6, nice and smooth power, running 192 header with the 2045 pipe on both engines. My old WS7 I finally decided to stop running, 6 years old, 10 gallons of fuel, original P&S, different rod and bearings, I think I got my moneys worth. How does the power range on the killer 9 compare to the C6 and the WS7 III? any idea?