Looking for websites for my n/a subie or any suggestions on minor modifications

depends what you are after, here's a few that have used or know for starters, I'm sure a few others will chip in with their suggestions.

http://www.just-subaru.com/. UK

http://www.japanparts.com/. Japan

http://www.avojdm.com/. Japan

http://pro-r.co.uk UK

http://www.scoobyparts.com/. UK

http://www.scoobyworld.co.uk/catalog/index.php. UK

http://asperformance.com UK