Previous generations of the Nissan GT-R were renowned for their unlimited tuning potential. Depending on your budget, it was possible to get up to 1,000 hp from the car's turbocharged 2.6-liter inline-six. But with the all-new 2009 GT-R, Nissan seems to have bowed to pressure from the Japanese government to keep modified cars off the streets, making it clear to GT-R owners that any modifications would automatically void the car's warranty.The list includes removal of the car's GPS-based speed limiter, which holds Japanese-spec cars to a laughable 112 mph. This can be defeated only when the nav system recognizes that the car is on an approved racetrack, and even then, you are obliged to get the car inspected after each track outing.