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Porsche is stuffing a built twin-turbocharged into the Cayenne Coupe, and it's the most powerful V-8 the German automaker has ever produced. It makes 631 horsepower in this new Turbo GT model, and Porsche says its factory driver Lars Kern set a new SUV lap record at the Nürburgring Nordschleife in it lapping the course in 7:38.9. The new Cayenne will arrive in the U.S, only in Coupe form, next year starting at $182,150. The massaged V-8 engine produces 631 horsepower and 626 pound-feet of torque, 90 hp and 59 pound-feet more than the standard Turbo Coupe. Total output might be less than the Turbo S e-Hybrid's 670 horses, but that powertrain uses an electric motor and a battery pack. This is solely the work of the internal-combustion engine. Porsche upgraded the V-8's crankshaft, connecting rods, and pistons; enlarged the turbos' compressor wheels; and increased the fuel injection flow rate and the intake and cooling systems' airflow to make the additional power. The eight-speed a
