let les tune it, he did my tune and I can walk most of the sports cars on the street. Which by the way, the best thing in the world is to see some guy in a vet that couldn't pull on you on the highway and watching his face when he realizes that les took the speedo limiter off your truck. He drives away (after you slow down) wondering "what the hell was in that truck?" and/or "whats wrong with my car?"