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Message: [QUOTE="TARM, post: 422200, member: 578"] No it could be that they do perform that way. After all much of it is up to the way they are oiled so I can see it. My point was more to how oiled perf filters tend to work. Until you get into the ones with more layers etc there is IMO always going to be a trade off. Its not the shape as that is actually done for a good reason as it allows more of the total surface area to be used more evenly than if its was just straight walled like the donaldson. Ideally I would love a Donaldson but with the same surface area but in a cone shape with media in the end as well. Also be offered with anywhere from the 4" to a 6" inlet port opening. That IMO would be a hell of a filter for the 7.3 and many turbos. [/QUOTE]

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