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Rebuilt MAF is like $400, paper filter is $32. The failure mode of a MAF is typically a slow shift in accuracy related to the burn off cycle where about every 5 times the car is shut off the wire is heated to burn off contaminants. I suspect the basic heat cycle has some wear and tear, but the presence of anything on the wire has to make it worse. So its not like you would put on a K&N and the car dies, more like the accuracy shifts beyond the 3% the brain can correct for in 3 years instead of 6 years.
I am also not that convinced that K&N actually filters as well as a paper filter.
For $32 I don't have to think about.
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