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if you pull the intake tubeing out. the hard plastic piece has a baffel in it to reduce noise, that can be cut out. BHAF refers to Big Honkin' Air Filter. I have one, a Napa 2790 air filter.
I didnt read into the add, just saw the filter, I dont know if it is a oiled filter or not, personaly I would stay away from the oiled type filters and just stick with a dry paper or nano fiber filter.