I wonder if anyone knows who started using this type bypass first, Fram or Champ Labs? I would guess Champ as it goes way back to "blue button." They seem identical. I have a lot of respect for Champ Labs filter designs, hope they make it as a USA business. As long as they get the louvers right, I don't think there has been a torn Champ filter shown ever? I'm sure Delco, Mobil 1, RP, TRD, and Ford OE helps their bottom line.