IF you cant get ahold of john, my second choice would be coastal dyno. sam is mostly a subaru/ford guy, but a good tuner is a good tuner, and SS stays pretty stacked up on the dyno so you may wanna give coastal a shout if SS dosent work for you...mind you the dyno numbers will be lower at coastal than at SS because it is a mustang dyno (it accounts for vehicle weight) where SS has a dynojet, which always shows higher numbers.