Thanks I'll have too play around with it tommorrow. I just never really knew. With my upgraded brakes I will kill the engine before I can build any boost. I thought maybe the guys I've sen doing this had double disc clutches. Powerstroker27 get a good aftermarket clutch and you won't have to worry about slipping anymore. I can't make mine slip no matter how hard I try. I got the South Bend Con FE. I think it's advertised at 550hp but it will hold more.