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  • Mercedes-Benz has one of the best brands-within-a-brand in its factory-tuner AMG division. Far from a body-and-trim badgeworks, AMG is building its own engines and developing its own cars these days. Its latest cars, like the 2010 SLS AMG, are powered by a normally-aspirated 6.2-liter V-8. But that's about to change--and one MotorAuthority reader can't wait. Even before Mercedes let loose details on its new powerplant, reader Paul Lindo wrote to us asking why AMG wasn't ready with a turbocharged engine to challenge BMW. He writes: "I have been admiring the new 2010 E63 AMG, and seriously...

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