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Today, Matt is in the all-new Audi RS7 Performance, which will be going up against a BMW M8 Competition and a Mercedes-AMG GT 63 S 4-Door! So, let’s take a look at what’s under the hood of these beauties. Let’s start with the Audi, and its twin-turbocharged 4.0-liter V8 engine that produces 630 horsepower and 628 pound-feet of torque. Power is sent to all four wheels through an eight-speed automatic transmission, and the car tips the scales at 4,500 pounds. If you want to buy one, you’ll have to pay 133,000 pounds. Next up is the BMW M8. Under the hood, you’ll find a twin-turbocharged 4.4-liter V8 engine that produces 625 horsepower and 550 pound-feet of torque. It’s equipped with all-wheel drive and an eight-speed automatic transmission, and it tips the scales at 4,500 pounds. This BMW is just £5k more expensive than the RS7, coming in at £138,000. And finally, there's the AMG. It's powered by a twin-turbocharged 4.0-litre V8 producing 639bhp and 666lb ft of torque. Power is sent to all four wheels via a nine-speed automatic gearbox, and it tips the scales at 4,500lbs. It's the most expensive car here, at £154,000. So is the performance difference going to make this a walk in the park for the AMG? There's only one way to find out - let's go!