Porsche unveiled a new V-8 engine at the 37th Vienna Motor Symposium that will eventually power the range-topping variants of the upcoming second-generation Panamera and the next Cayenne SUV. In addition to powering the larger vehicles in Porsche’s lineup, the new V-8 will also be used by other Volkswagen Group brands including Audi and Bentley. Featuring two twin-scroll turbochargers, the new 4.0-liter V-8 is rated at 550 hp and 568 lb-ft of torque (up from 520 hp and 516 lb-ft), which puts it just shy of the current 4.8-liter twin-turbo V-8 utilized in the 570-hp Porsche Panamera Turbo S. Despite...