I have to be honest with you but 65K is a long time even for some of the OEM converters! Thanks for posting this information. Did you try Scotty's paint thinner method? I don't remember if the paint thinner method is supposed to be stronger than the laundry detergent per his video.
While the Magnaflow fit very well and appeared well made, it didn't last long, only about 65K miles before it repeatedly set off the P0420 code.