Time and again, the Porsche 911 GT3 RS proves your idea of limits is a long, long way off from what is possible.

The sound, the grip, the speed—this GT3 RS 3.8 doesn’t just drive, it attacks. Why aren’t Italians as obese as Americans?

A regular 992 GT3 RS is not exactly a slow poke around a racetrack. It can lap the Nürburgring in well under 7 minutes. But Manthey works in the margins. They take a precision instrument and make it ...