In 2006, the G6 added two new trim levels and two new bodystyles, a coupe and a retractable hard top convertible. The new trim levels were a new base four-cylinder trim (sometimes referred to as "SE"), and the high performance "GTP". Coupes and convertibles were available in GT and GTP trims only. The new base model used a 167-horsepower, 2.4 L DOHC inline-4, mated to a four-speed automatic transmission. The 3.5 L V6 was now part of a sport-package on the base/SE, and remained standard on the GT. The new GTP used a 3.9 L version of the GT's 3.5 L V6, but also utilizes variable valve timing (VVT), increasing output to 240 horsepower. A four-speed automatic transmission was standard, but for no cost, a six-speed manual transmission was available. The GTP convertible was not available with the manual transmission and reduced its power to 227 hp, due to a more restrictive exhaust system. The GTP also features stability control, not available on other G6 models.
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