We have been seeing the PDK's give out at around 580 whp, although there are upgrades in the works (actually I have not been on the car forums much since my new HT obsession, so maybe the upgrade is a reality).
The thing about the PDK's is that they shift so fast that they enable the car to compete w/ a car w/ more power.
I was running about 600 rwhp on pump gas and my friends Turbo S w/ just a chip was hanging with me.
I was shocked. Unbeknownst to him, the next time I added some race gas and turned up the boost. Each .1 bars of boost make 35 more rwhp.
His reaction was "what happened...your car just took off"

BTW, in regards to the Evoms car, they exaggerate their numbers (of course nearly everyone else does as well) and that is why only dyno #'s can be trusted.
Actually over on 6 speed (the AVS of Porsch) only 60-130, mile, or trap speeds carry weight.