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AMG developed its own V8 engine (dubbed M156 in development) for the DTM series. This naturally aspirated V8 will also be used to replace most of the "55" models. The published output according to Mercedes varies from 457 PS (336 kW; 451 hp) on the C63AMG, to 525 PS (386 kW; 518 hp) on the C/CLK/R/ML/GL/S/SL/CL/E 63 AMG.

M156 L 6.2 V8 models
2007 S63 AMG (introduced at the 2006 Paris Motor Show) (facelifted for 2010 model year[15])
2007 ML63 AMG (introduced at the 2006 North American International Auto Show)
2007 R63 AMG (introduced at the 2006 North American International Auto Show)
2007 CLK63 AMG (introduced at the 2006 Geneva Motor Show) (used as Safety Car for the 2006 and 2007 F1 World Championship)
2007 CLS63 AMG (introduced at the 2006 Geneva Motor Show)
2008 C63 AMG (Sedan and Wagon) (facelifted for the 2012 model year)
2007 E63 AMG (Sedan and Wagon)
2008 CL63 AMG
2009 SL63 AMG
2010 E63 AMG (Sedan and Wagon)

The S63/CL63/SL63 at 518 horsepower edges out that of the S600/CL600/SL600, the latter powered by the 510 horsepower 5.5-litre twin-turbo V12, while also having a higher redline. However, the S600/CL600/SL600 are more expensive and have more torque at 612 pound-feet (830 N·m).[16] The S63/CL63/SL63 however do have quicker acceleration times than their S600/CL600/SL600 counterparts and are the second-fastest in the lineup, after the S65/CL65/SL65 AMG.[11][17]

Compared to the "55" supercharged 5.4 L V8 engine which was restricted to the Speedshift 5G-Tronic five-speed automatic transmission as it had a torque capacity of 796 lb·ft (1,079 N·m), the reduced torque of the "63" M156 6.2L V8 enables it to be mated with the more efficient [7G-Tronic which can withstand a limit of 542 lb·ft (735 N·m). Despite the reduction in torque, the increased horsepower and more efficient transmission enables the "63" models to match or surpass the acceleration of the "55" models.[18] Most of the M156-engined models used the 7G-Tronic automatic transmission, however the more recent 2009 SL63, 2010 E63, and 2012 C63 use the 7-speed MCT transmission.

In 2009, AMG developed the M159 engine which is based on the M156 engine, to be used in SLS AMG.

Although to be superseded by the M157 5.5 L V8 BiTurbo (see below) for full-sized models such as the S-Class, the M156 will remain in production as its more precise throttle response is still well suited to smaller sportier models such as the C-Class.
Rumored in 2009 and confirmed in 2010, AMG developed the M157, a 5.5-litre V8 with direct fuel injection and twin turbochargers. Power is rated at 400 kW (544 PS / 536 bhp) at 5,500rpm with a peak torque of 800Nm (590 lb-ft) made between 2,000rpm and 4,500rpm. An even more powerful version with the AMG Performance Package will produce 420 kW (571 PS / 563 bhp) and 900Nm (664 lb-ft) of torque. Both engines will be mated to Mercedes-Benz's 7-speed MCT transmission.[20][21][22] The 2011 CL 63 AMG accelerates from zero to 100 km/h (62 mph) in 4.4 seconds, and has a top speed of 250 km/h (155 mph) (electronically limited), while cars with the AMG Performance package can make the 100 km/h (62 mph) mark in 4.3 seconds and reaches a top speed of 300 km/h (186 mph) (also electronically limited).[23]

Unlike the M156 naturally aspirated 6.2 L V8 which was developed entirely within AMG, the M157 is based upon the M278 that will be found in the regular Mercedes-Benz S-Class and CL-Class. The M157's increased torque from both the regular version and performance package means the engine can be shifted into a taller gear sooner, keeping engine revs and fuel consumption to a minimum. The new M157 will have an engine start/stop mode and is lightweight at 204 kg. [20][21][22] The M157 is said to be ideal for powering full-size sedans such as the S-Class, but the older M156 will continue to be produced as its more precise throttle response is still well suited to smaller sportier models such as the C-Class.[19]

5.5 L V8 BiTurbo models will carry the "63" model designation, shared with the 6.2L V8 models.[25] Visually, the 2011 S63 AMG is differentiated from the 2010 model by the more angular design of the chromed dual exhaust tips, which also sport embossed AMG logos, as well as new forged wheels.[26] For the CL63 AMG, the new M157 engine coincides with the facelift of the CL-Class for the 2011 model year.

M157 L 5.5 V8 models (Twin-turbo)
2011 Mercedes-Benz CL63 AMG
2012 Mercedes-Benz CLS63 AMG
2012 Mercedes-Benz E63 AMG
2011 Mercedes-Benz S63 AMG
2013 Mercedes-Benz SL63 AMG
2012 Mercedes-Benz ML63 AMG
2012 Mercedes-Benz G63 AMG
http://en.wikipedia.org/wiki/Mercedes-AMG