Porsche has packed as much street-legal motorsports technology as possible into the new 911 GT3 RS. The result is a track beast that can lap the Nürburgring in 7 minutes, 20 seconds—making it the fastest current-generation 911. Powered by a 4-liter, 6-cylinder engine with 500 hp, the car can accelerate from zero to 60 mph in 3.1 seconds. Drivers who want to record their track times can opt for the Sport Chrono Package, which features integrated timers and a Track Precision App that logs data on speed, lateral …