What do y'all use to clean the the air filters in the BMS dual intake setup? Mine are looking like they need a washing. Do I just use compressed air or is there a chemical/cleaner to use? Thanks!
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NEVER use compressed air. You'll blow the filter material right out of the filter.
Just follow the instructions for a typical K&N filter. As for oiling, that's where the K&N oil is nice. It's red, so you just lightly apply until there's an even red tint.
Note that oiled filters actually work better once they've got a bit of grime in them. It takes a whole lot before they're actually restrictive.