Guys a dyno is a tuning device.
Some show hi some show low.
About Randy's Z either the car is a freako or the dyno was a freako.
I really don't think Randy is BSing.
I would think the Dyno could be BSing.
If the car runs 118-120 then it's making the power if not then the dyno was giving HP out like it was candy.
I have seen up to 30 RWHP difference from one dyno to the next.
Remember a lot tuners will show hi dyno #'s to bring in the costumers $$$
I say show me the MPH.
Pete