The front-wheel-drive 2008 Pontiac Grand Prix sedan is available in two different models, both with their own powertrain. The base Grand Prix has a 200-horsepower, 3.8L V6 underhood, while the GXP model packs a 303-horsepower, 5.3L V8. Both engines come with a four-speed automatic transmission.
The top GXP comes with a standard head-up display (HUD), which projects dashboard displays onto the windshield. The system is designed to enhance safety, but can be switched off if not desired. A performance-tuned suspension, 18-inch forged aluminum wheels, StabiliTrak stability control, and the Magnasteer II variable-assist power steering system are all standard on the GXP, which translates to a sportier overall driving experience. The GXP can accelerate from 0-60 in only 5.6 seconds, and its transmission features a TAPshift manual-shift function.
All Grand Prix models have quite impressive fuel economy ratings. The base Grand Prix is rated at 28 mpg highway, and the V8 manages to get 16 city, 25 highway.
A Special Edition Package adds a high-performance appearance to the base model, including an air dam, rear spoiler, body-color grille, and dual bright exhaust tips.
The Grand Prix has an especially spacious interior, including a back seat capable of carrying three adults. The back seats are split 60/40 and can fold forward or have a pass through for narrow objects like skis for objects as long as nine feet.
Both Grand Prix models have four-wheel disc brakes, but anti-lock is optional on the base Grand Prix. Front and rear side curtain air bags are optional on both models.
The standard OnStar system includes GM's Advanced Automatic Crash Notification (AACN) system, which can make crash data available to 911 dispatch, depending on the situation. The service can also accommodate an optional Turn-by-Turn Navigation system.
The Pontiac Grand Prix sedan carries over to 2008 without the mid-range GT trim. Also, Bronzestone Metallic and Stealth Gray Metallic paints have been replaced by Gold Mist Metallic, Dark Slate Metallic, and Dark Mocha Metallic for the new model year.
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 2008 PONTIAC GRAND PRIX STYLING | [6 out of 10]
Car and Driver: "Grand Prix has not aged well"
Cars.com: "Aging design"
Jalopnik: "kind of gawky"
Automobile: "slavishly obeisant to Pontiac's past"
Autoblog: "an overabundance of gray"
The 2008 Pontiac Grand Prix, while breaking from Pontiac's straked and cladded past, breaks little ground in the larger world of automotive styling. In 2004 it received a makeover with a sleeker outside appearance that did away with the much-maligned ribbed body cladding along the lower portion of the doors.
Calling it a "sports sedan wannabe," Car and Driver claims "the Grand Prix's image is one part swoopy styling and one part performance." Kelley Blue Book celebrates the elimination of Pontiac's ubiquitous tacked-on side body cladding "that once plastered every Pontiac with sporting intentions," claiming that it "has finally been banished." Automobile also remarks on the cleaner exterior styling when compared to prior generations, but feels that the Grand Prix "is a little underprepared for the competition."