Under the hood, AMG's engine builders swapped out a few of the 6.2 Liter V8's moving parts in favor of lightweight forged units like the pistons from the SLS super car, new connecting rods and a new crankshaft that together drop about 6 pounds off the internal assembly's reciprocating mass. This means that the engine not only makes an additional 30 HP, bringing maximum output up to 487 HP, but the V8 will rev a little easier as well. This means that the C63 AMG Performance Package Plus is able to sprint from 0 to 60 MPH in just 4.4 seconds, however the compact super sedan's top speed is still limited to 155 MPH.
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