Pontiac on launched the G8 GXP sports sedan for the 2009 model year, following the success of the regular G8. The GXP is the new range-topping variant of the Pontiac G8 lineup. Like the company's other GXP models, this high-performance G8 is expected to deliver more power and better handling than the base and GT models.

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The G8 GXP delivers a zero to 60 mph time of about 4.7 seconds, and a quarter-mile time of 13.0 seconds at 108 mph.

Power comes from a 6.2-liter LS3 small-block V8 engine delivering 402 horsepower and 402 pound-feet of torque. This engine is the newest member of GM's small-block V-8 family. It features a revised, larger-bore cylinder block, high-flow, L92-style cylinder heads; larger-diameter pistons; unique camshaft and camshaft timing; revised valvetrain with offset intake rocker arms; high-flow intake manifold; and high-flow fuel injectors.

The LS3 engine has an aluminum cylinder block with cast-in-place iron cylinder liners. Larger bores help create a 376-cubic-inch displacement. The block casting also features revisions and machining in the bulkheads to enhance its strength and improve bay-to-bay breathing. New pistons were designed for high-rpm performance.

New, high-flow cylinder heads aid engine breathing and are based on the large port and valve design found on the LS7 engine and other GM L76 engines. The larger-capacity, straighter intake port-design optimizes intake flow to the combustion chamber, an effect augmented by large valves, measuring 2.16 inches (55.0 mm) on the intake side and 1.59 inches (40.4 mm) on the exhaust side.

"More than just raw power, the GXP delivers the sophisticated yet exciting driving experience that enthusiasts expect in a car costing far more than the GXP," said Jim Bunnell, Buick-Pontiac-GMC general manager.

The standard Hydra-Matic six-speed 6L80 automatic can be substituted for a a new six-speed Tremec TR6060 manual transmission. The manual gearbox features: a shorter throw; premium gear synchronizers; stronger gears, housing, and bell housing; a single-piece counter shaft; and machined gear teeth. The automatic has a generous 6.04:1 overall ratio that enables a "steep" first-gear. The result is strong launch acceleration along with "tall" overdrive ratios that lower engine rpms for better fuel economy and reduced noise. A limited-slip differential is standard.

GM claims the GXP's handling was developed and validated on racetracks and highways around the world, including the famed N�rburgring racing circuit. The suspension employs a MacPherson strut design in the front and a four-link, coil-over-shock design in the rear. A direct-acting front stabilizer bar, decoupled rear stabilizer bar and lateral ball joints on the rear suspension deliver increased lateral stiffness for more responsive handling. The front suspension features fully adjustable caster, camber and toe; the rear suspension has fully adjustable camber and toe, for more precise tuning.

The Brembo braking system includes 14-inch (355 mm) vented front and 12.76-inch (324 mm) rear disc rotors, with quad-piston alloy calipers in front. The alloy calipers on the rear brakes have single-piston actuation.

The GXP rides on 19-inch aluminum wheels with performance-oriented summer P245/40R19 tires as standard.

Standard comfort and convenience amenities include: bolstered two-tone sport seats, a leather steering wheel, fog lamps, alloy pedals, a 230-watt Blaupunkt audio system, XM Satellite Radio, and OnStar.