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How many of you run oiled filters in your home furnace? The oiled filter biggest problem is they tend to foul out MAFs. I just don't see the advantage of taking the chance on fouling the sensors out when there isn't that big of an advantage power wise. I have used the full cone filter from K&N before and there isn't any noticeable difference in power or anything. Just that the K&N costs a lot more and seems to be more hassle to clean than dropping in a new paper filter.
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