GS 430 packs the twin-cam Lexus 4.3-liter V8, which has sequential multi-port injection (SFI) and variable valve timing with intelligence (VVT-i). It develops 300 hp at 5600 rpm and 325 lb-ft of torque at 3400 rpm. And it's quick -- under six seconds for the 0-to-60 mph test and 14.2 seconds to the quarter-mile post. Top speed, capped electronically, comes to 149 mph.GS 300 replaces the previous six-in-line engine with a new 3.0-liter V6 that develops higher torque across a broader band plus enhanced fuel economy figures for ULEV-level emission control. The V6 with direct injection and VVT-i runs up to 245 hp at 6200 rpm with torque reaching 230 lb-ft at 3600 rpm. GS 300 hits 60 mph in 6.8 seconds and passes the quarter-mile mark in 15.4 seconds.

Both plants operate through a new close-ratio six-speed automatic transmission, which has a sequential manual shifter with gated lever on the center console. And here's a new twist for Lexus: GS 300 adds optional all-wheel-drive (AWD) traction. The AWD device brings a wet-type multi-disc clutch and planetary gear set in the transfer case, with electronic controls to measure wheel speed and yaw rates, but hydraulic controls to modulate the torque split ratio front/rear - from customary 30/70 percent to a maximum of 50/50. The AWD version behaves like a rear-drive vehicle but can quickly shift to AWD mode on slippery roads.

Both GS 300 and GS 430 appear poised for action in sporty low stance with a long hood and windswept windshield. Flanks are taut and the silhouette is curvaceous but so smooth it scores a coefficient drag figure of only 0.27.

Sporty body elements are apparent -- a thick front valance with broad air inlet and integrated foglamps, rocker extensions below side doors, the stubby tail treatment with tall rear valance and twin exhaust pipes tipped in stainless steel. The GS cockpit orients toward the the driver. There are two bolstered bucket seats flanking a floor console, the steering wheel finished in wood and leather, and an instrument panel with 160-mph analog speedometer and tachometer plus an electronic digital odometer.

Interestingly, the gauge cluster is covered by a lens of variable transparency capable of changing the lens diffusion in different light conditions to enhance viewing. Centered on the dash is a large touch screen for controlling cabin features like climate and audio systems. Standard equipment on all issues includes leather upholstery and memory controls for seats with seat heaters, a keyless Smart Access system with push-button starter, in-dash CD changer, high intensity discharge (HID) headlights, and a host of air bags like side curtains and front-seat knee shields.

Options are limited to a DVD navigation system with rear backup camera, Park Assist, a moonroof, ventilated front seats and a power-controlled rear sunshade, a Pre-Collision System (PCS) to reduce collision damage, and a Mark Levinson audio system that boasts 14 strategically placed speakers. Despite adding so much hardware and sophisticated control systems, Lexus holds price points near the level of previous GS models. MSRP for the 2006 GS 300 is $42,900, the AWD version is $44,850 and a GS 430 starts at $51,125.

JUST THE FACTS

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