I will start by first saying I have been trying different motors for the past year and a half. Prior to this 18 month stretch I had been running vspec's. Well many motors later and after many gallons of fuel I am back with OS motors. They are just hard to beat as far as power output, mileage, simple tuning, and reliability. I also like the fact that a vspec runs great in a truck or buggy and only one pipe is required. Bottom line a great motor and you cant go wrong.