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Biggest issue with K&N filters is people believing the nut is to be used for install. The nut is for removal not installation. Using for install was the reason for many of the filter casing leaks over the past years. Also why they were banned by some racing organizations. It can't be stated...

The issue is people using the nut on the end of the filter for installation. The nuts purpose is only for removal, not installation. Lots of those issues could have been prevented with a proper marketing campaign that explained the nuts purpose. People tighten the can using the nut which...

I used Maxlife in my frontier. Works perfectly fine, no issues, feels exactly the same as Nissan Matic S.