I knew NAPA's were made by wix, just suggested both because both are not allways available everywhere. I also heard NAPA bought wix. Cant confirm though. The plugged bypass explaines the collapsed filter. I have not had a K&N oil filter apart so I can't comment on them, but from my experience, the K&N air filter is great for the track/ short time use but should not be used on a daily driver. They dont get regular service & will bypass dirt into the engine. My shop does at least 1 engine a week that had been "dusted" using a K&N air filter. I have been using the NAPA #1049 (long) filter on my 61 Tempest since day one when I rebuilt it, has been 9 years & over 100,000 miles since the rebuild!!
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