Minor changes mark 2006 for what Pontiac says is this slow selling coupe's final model year in its current design. GTO is based on a platform originated by Holden, General Motors' Australian subsidiary. It has a 400-hp V8 and a 4-speed automatic transmission. A 6-speed manual is optional. ABS, traction control, and a limited-slip differential are standard. Neither an antiskid system nor side airbags are offered. GTO seats four and has leather upholstery. Newly available are 18-inch wheels, clear tailight lenses, and night lighting for the standard steering-wheel audio controls.