Regular Imprezas used a 2.5-liter, horizontally-opposed four-cylinder engine that developed 165 horsepower. A smaller (2.0-liter) turbocharged engine went into the WRX, rated at 227 horsepower. When the WRX STi debuted during 2003, it held a 300-horsepower turbo. Imprezas may have either a five-speed manual or four-speed automatic transmission, but the STi came only with a six-speed manual gearbox. All Subarus have all-wheel drive. For '06, base-level sedans and wagons are renamed 2.5i from 2.5 RS. Like the Outback, they have 173 hp, a gain of 10. WRX models gain a base WRX TR sedan and a top-line Limited sedan and wagon. These retain turbo power, but replace a 217-hp 2.0-liter engine with a 230-hp 2.5.

Vehicle crash test information not available at this time.