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19Mercedes details new 503-hp twin-turbo 4.0L V8 for AMG GT

Mercedes-Benz can't seem to help itself from leaking out information about the upcoming AMG GT sports coupe, but this is one seriously big drop of news. We already know what its sounds like, but a new video reveals a ton of juicy technical details about its twin-turbocharged, 4.0-liter V8 called the M178, including its power and torque figures.

68Which would you rather have, Audi's RS5 or Mercedes' C63 AMG 507?

If you're in the market for a German sports coupe with a naturally aspirated V8, run, don't walk, to your nearest dealer because they are going to be gone very soon. European fuel economy and emissions rules have conspired to force automakers into seeking forced-induction mills. Motor Trend personality Jonny Lieberman is hosting the retirement party in the latest Head 2 Head video, where he takes on the 2014 Audi RS5 and 2014 Mercedes-Benz C63 AMG Edition 507 to decide which is the ultimate Teut

48It's so hard to say goodbye to the C63 AMG's 6.2-liter V8

Contrary to what most marketing tells us, progress is not always forward. Sometimes a product nails the balance of what consumers want so perfectly that it's nearly impossible to improve on it – just compare the original Ford Mustang to the atrocious Mustang 2. Drive's Chris Harris is worried the same fate is about to befall the Mercedes-Benz C63 AMG, which he reckons is at the top of the heap of German sport sedans.

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