I was reading an article about better speakers and such for the stereo in the 05 Imprezas. It is from a source in the Canadian market, but I imagine that the US will see similar improvements.
2005 IMPREZA: What's New?
Model Line Up-Changes:
For 2005 the main changes to the model line involve the 2.5TS and 2.5RS sedan and sport wagon. For 2005 the base car (sedan and wagon) will be renamed to the 2.5RS. The 2.5RS will replace the existing 2.5TS sedan and wagon as the entry level model for Impreza sedan and wagon, however the level of equipment will remain similar to the 2004 2.5TS. The 2.5RS wagon will have 16" alloy wheels as standard equipment.
There will now also be a 2.5RS "Sport Package" sedan that will offer several of the features of the WRX STi and WRX. This model takes the place of what was the 2004 Impreza 2.5RS. The 2.5RS "Sport Package" Sedan will feature the STi type front bumper with fog light covers, side sill and rear WRX spoiler. It will also offer a leather wrapped steering wheel, aluminum sport pedals, sport seats (WRX type), a center mounted tachometer and an upgraded audio system and a power glass moonroof.
There are several new colors added for 2005:
Crystal Grey (All models except Outback Sport)
Regal Blue (All models except WRX and WRX STi)
Obsidian Black (All models)
Product Feature Changes:
For the 2005 Impreza a number of changes have been implemented to refresh the interior design as well as a few subtle exterior revisions. The interior significantly changed with a new instrument panel, new door trim, new seat fabrics as well as new sun visors and new center console mounted cup holders. New design 3 spoke steering wheels are featured on all models. There is a new audio system for Impreza WRX, STi and 2.5RS with significantly improved audio performance. WRX will also get full automatic climate control. STi receives a new gear selector and standard anti-theft immobilizer system.
There is a new rear bumper for Impreza sedans with a wider rear wheel arch to accommodate a wider tire (from 7.5" to 8.0") on the STi models. New alloy wheels and a new large single tip muffler will be featured on WRX. All 2005 Impreza WRX models will feature new 10 spoke alloy wheels except the Outback Sport which will have a new 7 spoke design.
WRX manual transmission will be equipped with a double cone type synchronizer. All models except WRX switch to a drive by wire, electronically controlled throttle. All models with 4EAT except WRX switch to a new direct control type transmission.
STi will get aerodynamic underbody covers and a new helical limited slip front differential as well as a yaw rate sensor for the DCCD system.
Both WRX and STi receive suspension revisions as well as a new steering rack for improved driving performance.