Auto-Motor-und-Sport has put the Mercedes AMG C55 against the RS4 for a very fun comparison test (well fun for the drivers). While both cars are great, both being outfitted with great powerful engines, it seems that the aging Mercedes model needs even more power to catch the RS4. Take a look and you'll see what I am talking about.
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Isn't the next gen C-Class getting the 6.3L?