Here is the email I received from Chrysler regarding the dyno:

The Chrysler Crossfire can not be put on a dyno machine. This is due to
the Electronic Stability Program (ESP) the vehicle comes with. This
system uses the anti-lock brake system and throttle control to adjust
for tire slippage. When the vehicle is on the dyno machine the ESP
system reacts as if the vehicle is slipping due to the front wheels not
being in motion.

It looks like an AWD dyno is our only option.