I did my research and they are made in Korea as are AC Delco and Mann filters. In short, they are made in the same factory. Other aftermarket filters are made in China. I'm not saying there's a difference, but I think the OEM source would give a little more confidence, at least for me. I had an expensive branded filter ($16) that broke after use. Who knows how many kilometers I drove with it like this. This was not the case with K&N and AC Delco.
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