After Mercedes-Benz S63 AMG, Say Goodbye to the 5.5-liter Twin-Turbo V8

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The next-gen models could be powered by a hybridized 4.0-liter V8.

Dubbed the M157, AMG's 5.5-liter twin-turbo V8 has apparently reached its potential in the recently unveiled S63 AMG. That's according to AMG boss Tobias Moers who told motoring.com.au the 585 hp and 664 lb-ft of torque it develops cannot be increased without threatening reliability. The AMG variants of the S-Class, due out in the next three years, and refreshed CLS63 and E63 will probably the best last to get the M157, which first appeared back in 2011.

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Beyond that, we could see it replaced by a hybrid version of the all-new 4.0-liter V8 that is expected to power the AMG variant of the new C-Class, which arrives next year. Created by forging two of the A45 AMG's 2.0-liter turbo-four unit, the new V8 will also feature in the new baby-SLS 911 fighter. The 2014 Mercedes-Benz S63 AMG will arrive in U.S. showrooms this November priced from $140,425.

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