The 2009 Quattroporte has been simplified to base and S trims. The base trim is powered by a 400 horsepower 4.2-liter V8 engine, while the S trim's 4.7-liter V8 puts out 425 horsepower, and each engine is mated to a six-speed ZF automatic transmission. An electronically-controlled Skyhook suspension, standard on the S and optional on the base trim, automatically adjusts to the conditions of the road. Standard features include directionally-adaptive bi-xenon headlights heated leather power seats with memory, automatic dual-zone climate control, rear parking sensors and a Bose sound system with hard drive and navigation system. The Quattroporte S adds Brembo brakes and 19-inch wheels. Heating, ventilation and massage functions are optional for front and rear seats. A wide variety of alloy wheels, brake caliper colors, and leather and wood trims are available. For 2009, the Maserati Quattroporte has been freshened inside and out, and the S trim is new.