According to the pics you have removed the cats in the stock-headers, right?
I was under the impression that with removal of the cats in the headers and a software the s85 will make around 550hp at the crank.
But i have no personal experience with the v10, its just what i read on various forums.
Either way, your car is totally bonkers.
I wonder how much does it weigh?
And please invest in a go-pro.. we want to see it in action