I don't personally know anyone. Just relaying what I remember him tellimng me. I would check out Highlifters site and see if you can get ahold of anyone of the sportsman owners that have it. I have also not heard of any problems with it. His kits are used by GNNC racers. So they are definately abused. I know that you have to send the head in to have it ported and modified. Im not sure about the rest. You may want to give him a ring. Let us know what you find out cuz I may be going this route in the future. I just wish that HPD would make some engine mods for the 500 HO motor[img]i/expressions/face-icon-small-sad.gif[/img]