The GTO is an icon of the American muscle car automotive industry. This rear-wheel drive muscle car seats up to four people and comes standard with a black leather interior. It is powered by a 400 hp LS2 6.0-liter V-8 engine. There is the option of either a four-speed automatic transmission or a Tremec six-speed manual. Also standard are traction control and a limited-slip differential.For 2005, the Pontiac GTO receives a new LS2 engine and small design changes.