If it is a genuine 500bhp I'd say you're fucked, porkers always pull out figures FAR better than their power/weight suggests they would. I assume this must be down to the powerband rather than the peak power but I've also read at sometime (I think on G-Force Motorsport's website?) that they have incredibly low transmission losses in comparison to other cars.

To give you an idea of how quick they are BTW, the Factory Power Kitted (450bhp) 996 turbo did 0-100 in 8.8secs & 196mph in Autocar IIRC? So with 500bhp it must be in the mid-low 8secs to 100 & like Deano says, they really come into their own above 100.

Oh & also they are apparently virtually indestructable & will withstand countless full bore launches

But good luck & be sure to let us know how you get on