The V8 and W12 were not the only engines on the menu in Europe for the A8: Audi also offered 2.5- and 3.3-liter diesel engines, and 2.8-liter V6 gasoline units.

For the 2013 model year, the Audi ... A8 can be equipped with a carryover 500-horsepower, 6.3-liter W12 or two new engine offerings: a twin-turbocharged 4.0-liter V-8 (replacing last year’s 4.2 ...

Naturally, ABT started with a version of the A8 we can't get here in the States, the diesel. In stock form, Audi's 4.2-liter TDI V8 produces a healthy 350 horsepower and a yacht-towing 590 pound ...