In its metamorphosis from a humble Cayenne Coupe, the fastback-only Turbo GT sports the most powerful V8 engine Porsche has ever built, making it the automaker’s fastest, quickest-accelerating SUV. In fact, the flagship Cayenne recently broke the Nurburgring lap record for performance SUVs, circling the track in a lightning-fast, officially notarized 7 minutes and 38.9 seconds. Need some context? That’s a quicker lap than the 2007 Porsche 911 GT3 – all in a 5,000-pound SUV with comfortable seating for four, up to 51.7 cubic feet of cargo room, and a relatively smooth highway ride.