I've never had a problem with Fram filters that I can blame on the filter, but after I started cutting filters open on a regular basis, the cardboard end caps kind of spooked me.

I recently bought a small surplus of Carquest/Wix manufactured filters and found one defective one in the (the cartridge was physically loose and flopping around inside the housing, it rattled when shaken). One bad one out of about 20 purchased.

Buddy of mine lost oil pressure completely with a K&N.

Just saying they can all have defects, have to be careful.