I buy the Wix filters in bulk from fleetfilter.com
Quite a bit cheaper than what Napa up the street is selling them for. I grab one from them in a pinch but most of the time I try to plan ahead and buy a dozen at a time.
I cut filters open semi regularly. I just cut open a motorcraft filter FL1a from my sons mustang that I bought from Walmart and was very impressed to still see robust construction, a very strong media, spring loaded with the steel plate. Definitely not a cheaply constructed filter and looked much like a Wix inside.
I haven't cut open or even used an STP in 30 years.
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