Moving from the base GT to the $29,990 GTP model avails buyers of a 227-horsepower 3.9-liter V6, automatic climate control, a power driver’s seat, XM satellite radio, dual chrome exhaust, and Stabilitrak stability control. For an extra charge the 2007 Pontiac G6 GTP Convertible can be outfitted with most of the items offered on the GT (not including power adjustable pedals) plus GTP-embossed leather seat upholstery.