The fastest SUV in the world squares off with the quickest SUV in the world on this episode of Head 2 Head, presented by Tire Rack. The 600hp Germano-British Bentley Bentayga can reach speeds of 187 mph, making it the fastest SUV of all time. But the Tesla Model X P90D with Ludicrous Mode, can rip off a 3.2-second 0-to-60. Which is faster through the quarter-mile? We drag race the two to find out.