Ask him to pull up the gear ratio on the dyno chart, if its drops more then 1-2 throughout the run the clutch is slipping.
Its a 03 svt cobra. Kenne bell 2.6h + 18 psi + 12" jlt cold air intake + bf tb + kenne bell bap + 60 lb injectors + kooks long tube headers w "x pipe" o/r + MAC 3" catback. My car runs on 93 octane.
19* of timing.