Mar 6, 2009. General Motors is closing in on two historically significant moments in its 100- year history - both of which should be recognized by potential customers. March …. The Pontiac G8 is a rear-wheel drive sedan that was produced by Holden in Australia, and then exported to the United States, where it was sold by Pontiac. The G8, a rebadged Holden Commodore, was released in early 2008 for the 2008 model year in the United States, and in 2008 for the 2009 model year in Canada. The 2008-2009 Pontiac G8 GT and GXP was the brand's first muscle car sedan in over 20 years. The G8 GXP was also the most powerful muscle car Pontiac ever built, and it couldn't have come along at a better time. Pontiac definitely needed a shot of adrenaline in its lineup. With the demise of the Firebird and the GTO, the .