Boost controller or not, the car is going to be fast enough for me... eventually I'll get used to it, and buy a boost controller. The kit was sent with 8PSI, I'm basing 7 PSI because typically you lose about a pound. My goal is to be in the mid 400's with my current setup on a MUSTANG dyno. If I get it, great... if not, then I'll buy a boost controller and then I'll come after RCZ, in a push of a button... haha