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Message: [QUOTE="OBSWIZ, post: 85141, member: 767"] The Donaldson Tymar uses is not only a larger filter overall, but the thinner media allows for 202 pleats, leaving us over 5 times the surface area to pull from. This is why it can outflow and out filter a re-usable element as long as minimum radial clearance is maintained. Bean tested a Filthy Tymar intake on the dyno..made over 400HP, then removed it and it made the same HP.. So for the vast 99.99% of the 7.3's on the road 1 Donaldson is plenty. The WIX/NAPA 6637 is not a hydrophobic (water resistant) element and using it as an open element should be avoided. [/QUOTE]

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