They also dynod the GT and after converting back to flywheel HP, they rated it at 435. I believe it was in the motortrend article.

 

I've seen a big variation in GT dyno's so far. one site said it dyno'd 395 then motor trend or someone else more reputable dyno'd 375 or 380. I'm not believing any numbers until someone buys one at a dealer and goes to the dyno