We are all going to witness a bit battle in the upcoming few years between the twin turbo V8 motors from Audi, BMW, Mercedes, and even Porsche. The car in the video is an S7 tuned by ABT to 540 horsepower (+120 over stock) so basically a little more than what the 4.0 TFSI puts out in the Audi S8. The advantage for the S7 is that it has a dual clutch transmission versus the automatic in the S8. This allows it to hit 60 mph in just 3.9 seconds.

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The acceleration is very quick and the car pulls impressively until slowing down a bit around the 260 km/h mark. Hitting 190 MPH as shown on the speedometer (306 km/h) with just a tune is definitely impressive.