Just installed this on my Silverado yesterday. Wow, what a difference. Anyways, I was wondering if anybody else has installed the scoop on their truck did they buy the pre filter bag that covers the filter? With the scoop I understand water can get sucked up the scoop or mud if you offroad. I don't offroad the truck at all so I'm not worried about mud at all. With rain or snow where I live (Michigan) should I buy the pre filter bag to cover the filter or am I probably ok??