That must explain the low #'s b/c Fred put down 372 RWPH on the dyno at CM Preformance, but it wasent a dyno Jet. I guess those dyno jets must have some type of "correction" b/c most people say that they read diffrently then other dynos. The stock Mach 1 comes w/ 305 HP that comes out to about 275 to the wheels so they did gain about almost 100 RWHP. Did it say how much PSI it was pushing compared to the Cobra?