I would be stoked if it hits 400hp, wasnt particulary trying for a number just a good strong motor. I agree there's a few more HP to be had with a bigger carb - I wanted to try out an AVS2 as many people rave about them, after much deliberation i opted for the 650 over the 800cfm. I wouldn't mind throwing an air gap and a bigger carb on it eventually but I already had the weiand intake hanging around.