Yeah, this definitely isn't stock.
When you go to tune a car, often one of the main priorities is to improve the sound. There are several ways in which to do this, but the general logic is that louder is better. The guys over at 1320video recently came across this C6 Corvette Z06 and, well, just listen to the sound it makes and you'll get the idea. The car is only idling and already it sounds dangerous (in a good way). We're anxious to see and hear this modified Z06 when it hits a drag strip.
But until then, what we know about it comes directly from its owner: an LS7 V8 putting out around 600 rear-wheel horsepower. Eventually the plan is to have it spit out 750 to 785 ponies. Just imagine what that'll sound like.