A new engine with more power triggers a name change for base models of Lexus's sporty premium midsize car. The GS lineup starts with the GS 350, which has a 303-hp 3.5-liter V6 engine. It replaces the 245-hp 3.0-liter V6 GS 300. The GS 350 is available with rear-wheel drive or all-wheel drive. Unchanged for '07 are the GS 430 and the gas/electric hybrid GS 450h. Both are rear-wheel drive. GS 430s have a 290-hp V8. The GS 450h teams a gasoline V6 engine with an electric motor to produce 339 hp. Like other Lexus and Toyota hybrids, it can run on one or both of its power sources, depending on driving demands, and requires no plug-in charging. The GS 450h has a continuously variable automatic transmission (CVT). Other GSs have a 6-speed automatic. Traction/antiskid control and ABS are standard. GS 430 and 450h have driver-adjustable shock absorbers. All models have front knee airbags, front side airbags, and curtain side airbags. Also standard: leather upholstery and keyless entry/engine start. Many control functions are via a dashboard touch screen that also displays an available navigation system and rearview camera. Other available features include steering-linked headlamps and Lexus's Pre-Collision System, designed to automatically cinch seatbelts and apply brakes if an unavoidable crash is detected.