The model will use a Bentley-sourced 4.0-liter twin turbo V8 that produces 520 hp (388 kW / 527 PS). If this is correct, the Audi would slot in between the 500 hp (373 kW / 507 PS) BMW B7 Alpina and the 537 hp (400 kW / 544 PS) Mercedes S63 AMG. Of course, weight and traction will play a factor, so it'll be interesting to see how the car compares when the official specifications are released.
