For those that haven't heard of it, this might be an interesting link:
http://www.lingenfelter.com/Lingenfe...boCorvette.htm
For an extra $46K they put a twin turbo setup on a new Z06 that brings it up to 800HP. I don't have performance data but I doubt any production car in the world would be able to touch it. Lingenfelter is expensive but it's also 'OEM quality' so it's reliable enough and honed well enough to drive every day like a normal car.