The M5 CS uses the same twin-turbo 4.4-liter V8 as the rest of the M5 range. Here, this engine produces 627 horsepower, an increase of 10 hp over the M5 Competition. Torque output is unchanged at 553 pound-feet, and that power gets to the wheels through an eight-speed automatic transmission. BMW says the M5 CS can accelerate to 60 mph in 2.9 seconds -- there's that quickest-ever spec -- though that's only 0.2 seconds off the Competition's 3.1-second time. The CS gets a revised exhaust with stainless steel tips, so it should sound pretty sweet under full acceleration assault, too
And smaller kidney grills!!!