With no dyno to measure I'd guess that with my CNS carb from Zoom, tuned pipe from Sick Bike, Hand made intake for the bigger carb, Slant Head, I'm getting (close guess) minimum 1/3 more HP. I have a shift kit and Servas inverse tread tires. I can with calm wind do a honest 42mph on the highway. Speed paced by 2 different cars. I weigh 220lbs.