I know there are probably other threads on this, but i couldnt find them. So this past sunday i was racing the Desert 100 here in washington. I was going along at a good click and hit this rock outcropping and went over the bars. I gave myself a pretty good concussion. But my helmet has no scuffs on it and i cant find any damage in the foam. my helmet is a 2007 arai windham replica. i got it about a year ago. with no real bad crashes on it. so the question is, should i purchase a new one?