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The mid-size Grand Prix is one of the few "old" models in
's almost all-new
lineup and is basically a carryover for 2007. Five new exterior colors are
available, as are chrome-plated 17-inch wheels and a new standard tire pressure
monitoring system. The Grand Prix shares its front-drive platform with the Buick
LaCrosse and comes powered in its standard form by a 200-horsepower 3.8-liter
V-6 engine. The step-up GTP model offers a supercharged 3.8-liter V-6 that
generates a brisk 260 horsepower and includes an enhanced traction control
system. A four-speed, automatic transmission is included with both engines.
Meanwhile, the range-topping GXP model comes with a potent 5.3-liter V-8 that
generates 303 horsepower. This engine includes Active Fuel Management
Technology, which enables it to sip up to 12 percent less fuel by deactivating
half of the engine's cylinders when they're not needed, such as at cruising
speeds. The four-speed automatic transmission used with the GXP is
sport-calibrated and allows aggressive manual gear changes via Formula-One
racing style "TAPShift" controls on the steering wheel. The GXP also has a
firm-riding sport-tuned suspension, with StabiliTrak stability control included.