I searched through the old posts and didn't quite find what I was looking for. The old gen cars had all the speakers tied to a common ground and the new stereo decks require all speakers to be isolated from each other requiring that you rewire the speakers to get things to work properly. Is this true on the new gen cars....specifically my '97 Impreza. I'm planning on installing an aftermarket stereo and want to know whether to plan an hour for the job or an afternoon. Thanks in advance for information on this.

I installed a new stereo and speakers in my wife's 1993 Legacy about 2 years ago. I got the system from crutchfield and it didn't require any re-wiring. It took me a couple hours to put the entire system in. The directions they sent me were great. I really doubt that your 1997 Impreza would be any different.