When I was buying a new car I kind of figured cabin filters are standard these days. However after an off road trip this weekend on a dusty road, I figured I'd turn by vents up and I got sand blasted by them! The whole car is a mess too, this was a 5+ hour excursion so I had to have the vents on or windows down at some point. Owners manual just says take it to the dealer on cabin filters, my window sticker doesn't mention cabin filter either. So was a filter an option or was it maybe not installed by the factory?