Hey all, I was wondering if the K&N claims to only needing serviced once every 50,000-100,000 miles hold any water.  It seems to me that if they're catching the same amount of dirt as a paper element filter that they should need serviced just as often.  Being such, I've been servicing mine every 15,000 miles or so.  Has anyone actually let theirs run to 50,000+ miles without servicing?