The 429-hp 4.6-liter V-8 in the S550 combines numerous advances and twin turbos to deliver 12% more power. Its 516 lb-ft torque peak offers 45% more thrust at just 2,000 rpm. Rapid-multispark ignition can fire up to four times per millisecond, while high-pressure Direct Injection can microscopically fine-tune fuel spray in just 0.1 milliseconds, reducing emissions, fuel consumption and noise. A lightweight diecast-alloy block, quicker and more widely variable valve timing, reduced friction, and clever "on-demand" ancillary components like the alternator further boost efficiency.
For a balanced, comfortable ride, the AIRMATIC semi-active suspension employs electronically controlled air springs that adjust to changing driving conditions. A choice of two settings, Sport and Comfort, lets drivers match the ride characteristics to their mood. The system also lowers the ride height at higher speeds for improved aerodynamics. AIRMATIC also provides automatic 4-wheel level control, to help compensate for additional cargo or passengers.
Offered as part of both the optional Sport Package and Sport Package Plus One, the spirit of performance takes shape in an aggressive front air dam that draws the wind, and the eye, past sculpted lower side sills and around a seductively styled rear apron.