As the first-ever rear-drive hybrid, the Lexus GS 450h is full of technological advancements that drive this sedan and its V6 powerplant into the 300-plus horsepower category. The engine is a 3.5-liter unit with variable valve timing that makes 292 horsepower at 6,400 rpm and generates 267 lb.-ft. of torque at 4,800 rpm. This is mated to a hybrid system that incorporates two motors. One, which outputs 180 maximum horsepower and 650V (volts), is for engine starting and speed. The other (650V, 197 hp) is for driving the rear wheels and for battery regeneration. The battery is a 288V nickel-metal hydride unit that outputs 35kW (kilowatts). When mated to the 3.5-liter V6 engine and the continuously-variable transmission (CVT), the combined power output reaches 339 horsepower.