So according to that dyno graph, the tuner is saying the car has approx 14% drivetrain loss. Markus and Kreso may be onto something here...isn't the Z06 rated at 510hp for Europe vs. 505 in the US? I was sure I saw a different power rating for European destined Z06's somewhere.

BTW, that dyno graph of the 911TT producing 464whp with a 480 crank is crazy. I guess there are anomalies out of every factory. My Z was put down 493whp with just a tune, while other Z owners were putting down the same powerm but required exhaust mods.