A lot of folks, including myself, put their filter over behind the fender, and even build a close-out panel to house it in. The idea is keeping the filter out of the hot engine bay air. I cut a 4" hole below mine, and made a scoop, mounted on the bottom of the inner fender, behind the bumper, to keep splashed water out, and aid in cooler air charge. I made my close-out panel to where it bolts in place, to help make air filter main trance not so terrible. I'm running Mast M90 electronics, and they recommend keeping filter out of engine bay heat, so I kind of did mine this way out of necessity.
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