Subaru's Impreza line has 10 models, both sedans and wagons. All are powered by a variant of Subaru's 2.5-liter horizontally opposed four-cylinder engine. All come standard with full-time all-wheel drive and a manual transmission. A four-speed automatic is optional on most. Safety features on all models include dual front airbags, front side-impact airbags, and seatbelts with pre-tensioners and force limiters for the front seats. ABS comes standard and features four sensors and four channels. Electronic brake-force distribution also allows for better emergency braking.For 2006, the Subaru Impreza models have been restyled front and rear. Power has increased at least slightly across the board. The body structure has been improved and the suspension refined. There's more standard equipment, more safety equipment, and more new technology.