For 2004, the Linear model is available only as a wagon. Arc models drop their 200-horsepower V6 and standard automatic transmission in favor of a 220-hp, four-cylinder turbo and a five-speed manual; an automatic remains optional. The Arc also picks up lower body cladding and is eligible for a 17-inch sport wheel package. Bi-xenon headlights are now offered as a stand-alone option on Arc and Aero models. Ventilated front seats, previously standard on the Arc, are now optional. Additionally, Aero models get a more aggressive lower body kit.