The final year of the modern GTO arrived in 2006 with a significant performance upgrade: a 6.0-liter LS2 V8 producing up to 400 horsepower. This increase brought the car closer to classic muscle car levels of straight-line speed while preserving its refined driving character. Limited production numbers and its status as the last GTO model before Pontiac’s eventual closure have made the 2006 version especially desirable among collectors and modern muscle enthusiasts.