The Cayenne Electric made headlines yesterday as the most powerful production Porsche ever. With launch control, it (temporarily) unleashes an astounding 1,139 horsepower and 1,106 pound-feet (1,500 Newton-meters) of torque. But straight-line force isn’t the only eye-opening figure. At 5,831 pounds (2,645 kilograms) without a driver, the Turbo variant is also the heaviest vehicle Porsche has ever built. That distinction previously belonged to the (deep breath) Porsche Cayenne Turbo E-Hybrid Co...