I love Pink Floyd’s music, but Waters has always struck me as one of those “artiste” types who is long on wind and short on brains. His solo stuff is so preachy it’s hard to listen to.
My 1998 with 150,000 on it is doing the death rattle from the catalytic converter. I'm thinking new exhaust
My wife's 98 Cherokee got the cat rattle at about 150,000 miles as well. I bought a new Magnaflow cat on e-bay for about $80 and had it installed by a local exhaust shop. Cost me about $150 all told.
The guy at the shop told me that the baffles inside the cat wear thin over time and will break off and rattle around inside the cat. Just replace the cat and you should be fine.