Mercedes-Benz will be adding its 5.5 liter bi-turbo V8 to the 2012 E63 AMG with a performance package that take total output up to 557 PS (410 kW / 549 bhp).

In its standard configuration, the new power plant makes for 525 PS (386 kW / 518 bhp) - same as on the old 6.3 liter unit.

But this new engine is far more efficient than that large, naturally-aspirated 6.3 liter, shaving 2.8 liters/100 km off of its fuel-economy rating - now down to 9.8 liters/100 km for the 5.5 liter bi-turbo V8.

And with that new AMG performance package, the new E63 with 557 PS does the 0 to 100 km/h (62 mph) sprint in just 4.2 seconds and has an electronically-limited top speed of 250 km/h (155 mph). The AMG Driver's Package gets that top speed bumped up to 300 km/h (186 mph) if you do your homework and take a driving class at the AMG Driving Academy.

The new 2012 E63 AMG is priced at €105,791 and €108,409 for the sedan and wagon variants, respectively, in Germany. The AMG Performance package costs €8307.

Gallery: 2012 Mercedes E63 AMG gets more power from new 5.5 liter bi-turbo V8

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