The Nissan GT-R has been upgraded yet again, and not surprisingly, it's been made even better. How good, though? To find out, we brought this latest GT-R to the Edmunds.com test track to generate performance numbers. Acceleration was tested with 0-60 and quarter-mile tests, while braking was calculated using 60-0. Handling tests included a timed slalom and two trips around a skid pad to generate a lateral acceleration calculation.