Assuming the stock motor made 807 at the crank, that’s 151hp driveline loss. Testing wasn’t done to maximize the number, just to test the car and establish a baseline. It was only a 5th gear pull, and the car has 3.09’s. 6th gear would be closer to 1:1, and 2.62 would also drive the whp numbers up. What’s important is the delta. Adding that same 151 to pull 1 equates to 1,118hp hypothetically at the crank.