I cut open my first oil filter yesterday using my Harbor Freight exhaust pipe cutter. It was a Performax PO-19 (apparently made by Purolator) and it had no tears. I was actually pretty impressed with the uniformity of the pleats and the lack of waviness often found in Purolators. I would use these filters in a heartbeat if I could be sure they were all like the one I cut open. I apologize for the lack of pictures but I don't have that capability.