It depnds on which one you looking at the VIII,RS,or the MR? 03 is the VIII 04 there technically wasent one it was just the rs and left over 03 VIII 05 they change the gear box turbo and diff/trans(six speed) and the grill looks like a VII and the rear has a defusser (sp) and the wheels are noww forged BBS which saved 2.6 pounds in each corner the 05 is basically the MR from 04 with body chages :? Dean pick up the Feb issue of Car and Driver they have the chages from the last couple of years in it and compares the 05 Sti and the EVO(EVO wins the track times)
http://www.caranddriver.com/article....rticle_id=8536
http://www.caranddriver.com/article....rticle_id=9052