I've been trying to find stock air filters.. I'm one of those weirdos that like to run his machine stock. However I can't find them all to well (Canada btw) and when I talk to the dealer they want a whopping $75 per side! At this rate it's cheaper to run K&N for $105 a set. However I don't want backfiring etc... Is there a good place to get stock? Or is there something I can do to prevent the backfire? Thanks.