For torque, yes. Unfortunately that doese not resolve the inaccuracies present in the dyno itself. You may be off as much as +/-5% maybe even more. If the shop has it available, see the last time it was calibrated (if they even have it calibrated beyond first install). I'm going to do some digging on this and see which dyno actually gets calibrated.
Yeah, there are services that calibrate dyno's:
http://www.taylordyno.com/oth/oth.ht...FRwpawodOwR-_A