What comes under the hood of a front-wheel-drive 2007 Pontiac G6 Convertible is entirely dependent on the exterior badge. If there are only two letters, GT, momentum comes from a 12-valve, 3.5-liter V6 featuring a cast iron block and aluminum heads; this base engine is rated at 201 horsepower at 5,800 rpm and 221 lb.-ft. of torque at 3,800 rpm while running on regular gas. A four-speed automatic with a manual-shift mode is the only transmission available. The EPA suggests that drivers will realize 19 mpg city and 27 mpg highway with this setup.

If, however, there’s a shiny GTP badge on the trunk, a bigger V6 is at work. In this case, it’s a 12-valve, 3.9-liter six-cylinder engine that also uses a cast iron block and aluminum heads but tosses variable-valve timing into the mix. The GTP packs a little more punch behind the accelerator, to the tune of 227 horsepower at 6,000 rpm and 235 lb.-ft. of torque at 3,000 rpm, again, courtesy of low-grade petrol. With a four-speed automatic pushing power to the front wheels, fuel economy is expected to reach 18 mpg in the city and 26 mpg on the highway.

Regardless of which trim is chosen, the respective engine is charged with moving about 3,800 pounds of mass, or roughly 400 pounds more than a comparable 2007 Pontiac G6 Coupe. A MacPherson strut suspension keeps the front end riding smooth while a multi-link setup takes care of the rear. Front and rear stabilizer bars, traction control, and stability control systems aim to benefit handling. Stopping the 18-inch alloy wheels wrapped in 225/50 tires is a set of four-wheel-disc antilock brakes, and a large steering wheel is connected to a rack-and-pinion assembly.