Why pay an extra $8,000 to move up from the base Pontiac G8 to the GXP? That’s the question Cars.com’s Joe Bruzek took on when he reviewed the 2009 G8 GXP in this video. There are key improvements, from throatier exhaust to increased horsepower, but also a few details missing. How much do these things matter when looking to upgrade from the GT to the pricier GXP? Watch the full review to find out.