These midsize sedans are slightly larger than Pontiac's G6 models. Grand Prix comes in three models. Base models have a 200-hp V6. GTs have a 260-hp supercharged V6. GXPs use a 303-hp V8 with GM's Active Fuel Management, which deactivates four cylinders while cruising to save fuel. All engines team with a 4-speed automatic transmission. GXP adds Pontiac's TAPshift steering wheel paddles for manual operation. All models come with OnStar assistance and 4-wheel disc brakes. GT and GXP add ABS and traction control, which are optional for the base model. Curtain side airbags are optional on GT and GXP. A navigation system is available.