well i obviously cant give horsepower numbers but i can say it ran better from idle to wide open than it did with the X-can and it ran better from idle to, i'm guessing half the normal operating RPM, than with the Jetpro. In other words, i'm gonna weld on the Jetpro silencer, maybe get it re-chromed and continue running it since it makes good usable power and will not get turned into a pretzel the first time it hits terra firma from 2 feet in the air