Hold onto your horses, Porsche fans. The newest Porsche 911 GT3 variation has landed. The fifth generation may have the design cues in the legacy of the 50th anniversary 911, but the real revolution is in the technical advances under the hood. A sequential-shifting, dual-clutch transmission, active rear-wheel steering and electronically controlled, fully variable rear differential lock and dynamic engine mounts are featured in the GT3. The six-cylinder engine races from 0 to 60 m.p.h. in 3.3 seconds, and its top speed is 195 mph.