The Audi RS7 Sportback is one of the most dramatic-looking big fastbacks ever made, and what powers it is equally special. Hiding under the RS7's long hood is a 4-liter twin-turbo V8 engine, found in ...
The familiar 4.0-liter V-8 now has a bigger pair of turbos and three additional pounds of boost, bringing its power numbers to 621 horses and 627 lb-ft of torque, 30 hp and 37 lb-ft more than the ...
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