Switzer Performance pulls off this monstrous upgrade with bigger turbos, bigger intercoolers, custom fuel management, and by surgically removing emission components such as the catalytic converters.

Switzer Performance's P800 Nissan GT-R

The final results are brutal – over 700 horsepower at the wheels, while keeping the rest of the car intact and on a diet of 93 octane fuel.  More pictures and first drive comments can be found at Jalopnik.com.