You can use 2 1/2" shop vac hose. It will run up and over the fenderwell, underneath the liner, and come out the fenderwell opening once you
remove the intake resonator. It's not exactly ram air, but it does deliver cool external air right where you need it. BAT sells a kit but you'll still need to be creative to get a good setup. Rain/water has not been an issue. (Poke several small holes in
the down side of the hose to help drainage)
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