Well, these have upgraded compressor wheels in the stock VTG turbos. So bolt ons in the meaning they have the restrictive turbine side still. Versus say an AMS Alpha 10 kit with ball bearing turbos, larger turbine side, and external wastegates. But they are probably close to 730-760 whp. Maybe closer to that 800 whp number. The 911 turbo seems to do well with less peak power when compared to some other cars. I am sure due to the great low/mid range power they make. They start pulling hard above 3K where other cars may have to get within 1000 rpm of peak power to really start pulling.
I think most times are around 5.9 to low 6's on pump gas. But on E85 pushing the turbos hard, they can dip in the 4's. Which is just crazy.
I think they like the cruising start at 60 mph because big turbo cars that take a while to spool get shown in their times that way. If you have quick spooling turbos or rolling anti-lag it doesn't much matter.