I asked a hood manufacturer that same question(years ago), he said that the K&N filter was oiled up and that would repell the water. I never did decide on one though.
JL1314, how long have you had that hood? My mechanic said that the ram air hoods always seem to crack and I'd be better off with a 4" cowl. Do you have any cracks of any kind?
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Rick
My 89lx(updated 7/20/2001)
My 97 Cobra