143k 2011 1500 5.7 Ram and had to replace the cats. They were rattling pretty bad when cold and not as bad after driving and warming up. Replaced with catco cats so don't know how long these will hold up. $500.00 to replace both of them. I had been throwing a P0420 low flow bank 1 and bank 2 codes for a while now so I suspect they have been going bad for 40k miles or so. But I would delete code and had no other issues with loss of power or anything else. When they took the cats off you could shake them and hear the innards rattling around.