- STi new aerodynamic underbody covers.
- STi new wider wheels, either 8 or 8.5.
- STi new hellical limited slip front differential as well as a yaw rate sensor for the DCCD system.
- STi upgraded security system now standard.
- new upgraded stereo
- STi/WRX: new steering rack.
- new colors: crystal grey & obsidian black.
- STi/WRX: new 3 spoke steering wheels on all models.
- STi has a new gear selector.
- STi: standard anti-theft immobilizer system.
- STi/WRX: new rear bumper for impreza sedans with a wider rear wheel arch to accommodate a wider tire from 7.5" to 8.0" on STI models.
Supposedly only a 'moderate price increase' ($500-1500 CDN) but firm pricing isn't going to be available until around May. The new '05s are supposedly going to be available for sale for June in Canada.
* This list of unconfirmed changes are from Subaru of Canada