TCS racing ---- you seem to have gone full circle. Not really sure what the direction you were trying to obtain, but the Viper inherently goes through the corners/sweepers faster than a Porsche. I frankly really enjoy Porsches, am a DE Instructor, but this is just physics, and when a turn or twisties come up most of the Porsche guys get out of the way of a Snake ---- it's physics man. Engine in the rear, see the pendulum swing, mid engine ( yes, the motor is behind the front axle of the Viper ) beast with near 50/50 weight distribution and watch out around the curves.
There is a reason the Snake ran a 1:33 at Laguna Seca and just weeks later a twin Turbo ran a 1:37. Love the GT3 , but the times are not stacking up to an ACR at VIR, Laguna Seca , Willow, or Nurburgring, so not sure about the straight line verbage. Heck at Nurburgring that was it's problem , hence the new 5th gear to allow it to pull decent speed down the straights. Pick up a Road and Track ( if memory serves me right ) and the top G force listed is an ACR.
Nuff said, because as Chuckie mentioned, these cars have been restricted to death by practically every motorsport venue to try and keep them from running away from the crowd!