Only thing I’ve noticed about these personally is the flex pipes are weak/break causing leaks after primary o2s’s. The cats themselves would normally last unless allot of raw fuel or oil, continued misfires and stuff damage them. Unless they make them outta weaker material now, I had 90’s vr6 cat last many original years. Magnaflow does offer weld in Cali/obd2 leagal cats ( need to buy 2) both May be quite less then factory downpipe. It’s rare to come up on it used. Gti ones are common cause they get ditched for 3in.