Engine/Suspension/Drivetrain

larger wheel hubs and bearings
larger wheel bolt circle diameter (from 5x100 in 2004 to 5x114.3 in 2005)
17x8 wheels (17x7.5 in 2004)
1 inch wider rear track
revised power steering rack
power steering fluid cooler
stiffer steering rack mounts
3-point rear suspension crossmember
aluminum rear suspension lateral links
helical limited-slip front differential (Suretrac LSD in 2004)
revised DCCD system
new Yaw sensor for DCCD (part of the lateral G sensor)
revised ABS controller
optional short shift kit

Exterior

aerodynamic underbody panels
rear wheel arch flares
redesigned rear bumper
revised exterior badging (black instead of chrome STi badges)
smoked headlight lenses
new paint color - Crystal Grey Metallic

Interior

smaller diameter steering wheel with black center area
redesigned center console
2 cupholder indentations in center console (no more dashboard pop-out)
redesigned center stack with aluminum-look trim
automatic climate control with automatic vent selection feature
80-watt, 6-speaker AM/FM stereo with integral 6-CD changer standard
revised seat cushions with new side bolster material
revised interior door trim
side mirror controls moved to driver's door (from center console)
DCCD controls relocated on center console
upgraded sunvisor material
redesigned anti-glare finish on windshield behind mirror (no more center visor)
Immobilizer key
redesigned keyless remote keyfob
cruise control standard
air filtration system standard
rear passenger cupholders standard
optional auto-dimming mirror with Homelink