Pontiac replaced its best-selling car during the 2005 model year with the G6. This new midsize sedan takes over from the compact Grand Am, which came only as a coupe for an abbreviated '05 model year. G6 shares a basic front-wheel-drive design with the Chevrolet Malibu and the 9-3 from GM-owned Saab. G6 has a slightly longer wheelbase than Pontiac's other midsize car, the Grand Prix, but is 9.3 inches shorter in overall length. G6 offers base and sportier GT models. Both use the 200-hp 3.5-liter V6 and 4-speed automatic transmission offered in Malibu. The GT adds a manual shift gate and a firmer suspension with 17-inch wheels vs. the base's 16s. Both versions have 4-wheel disc brakes. The GT comes with antilock brakes, traction control, and power-adjustable pedals, all of which are available for the base G6. Front torso side airbags and head-protecting curtain side airbags are available as a single option. Leather upholstery and OnStar assistance are exclusive GT options. Satellite radio and remote starting are available on both models. So are a conventional sunroof or a "panoramic" power sunroof with a tilt-up front section and three rear-sliding panels that open to near the full length of the passenger compartment. Due for 2006 are coupe and retractable-hardtop convertible body styles, along with a 4-cyl base model and a high-performance GTP with a 3.9-liter V6 and available 6-speed manual transmission.