I have a MX/ hardcore port from hjr, 4 mil, 35 pwks, t5, 20cc domes. I came from a bone stock bike. Pipes and that's it. First time getting on it, it scared the shit out of me. It stood up the first 3 gears on the street and 4 rode out about a foot off the ground. Properly set up 4 mil stockers can run.