SPY VIDEO: 2011 Mercedes-Benz CLS AMG Sports Sedan

It won't be long before Mercedes-Benz pulls the covers off the second generation of its slinky CLS sports saloon codenamed C218, but for now, we can offer you a spy video of the racy AMG version shot in and around the Nurburgring circuit.

Despite the fact that the hottest version of the CLS family will retain the CLS 63 AMG moniker, the car won't get the naturally aspirated 6.2-liter V8 engine. Instead it will be propelled by the Stuttgart's newly developed 5.5 liter bi-turbo V8 powerhouse.

Breathed on by direct injection and twin turbochargers, the smaller displacement V8 engine churns out 544HP and 800Nm / 590 lb-ft of peak torque [in standard form], an increase of 37HP and more importantly, 125 lb-ft over the current CLS 63 AMG's V8.

There will also be an even more powerful version of the same engine offered as part of a performance package with 571HP and a mind-boggling 900Nm or 663.8 lb-ft.

The new 5.5-liter bi-turbocharged V8 will be hooked up to Mercedes-Benz's seven-speed automatic transmission.

The new CLS range is expected to make its world premiere at the forthcoming Paris Motor Show in October.

Via: Youtube/AMS