hey guys, I recently got a #5 plate and had my gov. springs tightened. It made a big difference and the truck is now a blast to drive but the clutch is now slipping as well. I don't think I will do much more to this truck performance wise except maybe a mild injector upgrade. I was wondering if anyone has used the Valair clutch and how did you like it ,13 in or 12 in,and list your hp as best you can estimate. Do I need a 13 in clitch?