STP and SuperTech are the exact same filter. Decent filter area but cheaply made and the felt end caps detached from the filter media with frightening ease. No by-pass valve.
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Mopar and Purolator PremiumPlus are the exact same filter. Plenty of filter media with metal end caps which are impossible to remove from the filter media as seen by the dead Mopar filter.
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Purolator PureOne and Bosch are the exact same filter. Largest amount of filter media with metal end caps which are also impossible to remove from the filter media.
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All four of the latter are made by the same manufacture with the only difference between the two sets is the Mopar/Purolator PremiumPlus has the by-pass valve in the front, built into the stem..
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...and the Bosch/Purolator PureOne has the by-pass valve located in the back via a 45-speed record adapter spring thingy along with 4 more pleats of filter media. Also, the PureOne has the best paint job. A nice royal blue w/ pearl coat
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(Now has a nice Yellow coat of sandy grip paint)
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The Wix and NAPA Gold are the same filter but the NAPA Gold had 4 more pleats (61 vs 57) than the Wix. Was this by design or was it a machine assembly variance, probably the latter since everything else was exactly the same. The filters were similar to the Mopar and the Purolator PremiumPlus but made by someone else. They had a similar stem based by-base which was not attached to the filter media but loosely sits in the end-cap without a gasket. The Wix and NAPA Gold also had the second least amount of filter media. They had metal end-caps with the filter media permanently attached.
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The Mobil 1 and the K&N are exactly the same filter less the 1" bung thingy on the K&N. Both are heavy due to their thick bases and smaller inlet holes. They too had the stem based by-pass valve firmly attached to the end-cap but only had 55 pleats, the second fewest. It did have the deepest pleats which equals fifth in area and the filter media was slightly thicker than most. Had metal end-caps with the filter media permanently attached.
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Here the #'s (sorted by price):
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