Hey there...I'm in Canada as well and have done a TON of research this past week. My brother and I recently got into purchasing wrecked WRX's/Lancer's and are planning to do some Rally racing in the future ourselves. Seeing as we need a solid solid source for parts, here's the best sources in Canada I've found so far:
http://www.rocketrally.comhttp://www.rallysport.cahttp://www.pdm-racing.comWithout question, Rocket Rally is going to be your best prep shop in Canada - particularly for Subarus(but, they do Lancer's as well). It is
run by 2 time Canadian and 2004 Canadian, USA and north American Champ
Pat Richard. He has access to DMS suspension and all the bits you'd
need, and if you want a fully-prepped Rally car, they start at $8,000 :)
Granted the above sources are geared towards Rally racing, but, the racing guru's are without a doubt, the best source of information and products. If you find any others, let me know.