For what it's worth, I've ripped apart the napa silver (wix) filters the last two oil changes, and they are very high quality. No paper in them whatsover, rubber and steel with filter media.
The only way I can think to improve them, which I couldn't tell by sight, is to use a better filter media. Not that there is anything wrong in the silver, just that I can't see a way to improve the rest of the filter.
Oh, BTW, looks like Napa has changed the filter packaging for Silvers, but the same filter inside, still says "silver" on it, and is internally the same. Although the new ones do say "made in england" on the box.