Originally introduced in 1992 in Japan, then shortly afterward in New Zealand, Australia and Europe, the WRX features a turbocharged 2.0L (then later a 2.5L) version of Subaru's EJ series flat-4 Boxer engine. Compared to the base Impreza, the WRX also has wider wheels with lower profile tires, larger brakes, and firmer, higher-quality suspension components. The Impreza WRX was first sold in North America in 2001 as a 2002 model year.