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Well you don't want anyone to know your buying $60 retail filters at whatever and selling them for $120. I was asking on the org if anyone had better pictures of the IPR.
In my world of construction equipment design engineering, if a supplier wouldn't tell me their level of filtration, I'd tell them "then we can't use your filters and let me know if you change your mind about sharing that info". I extend that mentality into decisions about my $6K engine as well.
