has anyone ever used the G-Tech Pro in their Z?

In my Z, no...but I did use one when I still had my Lancer.

Neat gizmo, but since it's accelerometer based, not totally accurate. When my uncle used it in his Challenger, it was generally about .3 seconds behind the actual 1/4 mile time.

We never dyno'd the car, so we can't say how accurate the HP readings are.

thanks.

Jeremy Clarkson is my hero too!