We tried AWD, but the front wheels would not turn the front rollers and it was not mechanically linked. So we had to do it in RWD. So yes, both RWD.

 

Maybe sounds like the program could have been still in AWD with that difference?
I say that because back at the beginning of my mods,, At CPTs AWD DDs Dyno I made around 425 AWD HP and then went to a DynoJet Rear Wheel at Porsche Exchange and made around 500 RWD..

 

We've dyno'd a Corvette on this 2WD DynoDynamics dyno and then on a 2WD Dynojet the next town over, on the same day. This is where my 18% number came from.