gottorg33: Kind of off the subject, but what boost psi are you hitting with your b-i and the Mach 5's. What housing is on your b-i and what transmission do you have. I'm thinking of swapping my bully dog 5's for some Mach 5's, but I'm on my stock head gasket and i have a standard b-1 exhaust housing. i'm hitting 52psi right now.