Switzer Performance Innovation, SPI, or just plain Switzer, was recently contacted by a client from New England who felt the need to cut some of the fat off of his standard GTR's 3,800 lb weight.
Oh, and he felt it needed more power, too. The goal was an ideal track-day car that could get there, run, and still head out for an evening while providing full comfort and amenities.
Step 1: Install the P800 power kit, which adds new intercoolers, intakes, and turbos. This gets the car to 800 horsepower and "almost 700 lb-ft of torque."