Ok so I can't really tell you if this filter is actually any better than an OEM filter or any other aftermarket filter. I bought this filter because of K&N's reputation over other filter options for the Ram 2500 6.7 diesel engine. My five star rating is really based on two factors. 1. Buying through Revain was $3 cheaper than buying through Wal-Mart. 2. Ability to use an open-end wrench to loosen the filter instead of a filter wrench.
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