Rattling Noise from Catalyetic Converts - advice needed

[peterbrown77]

I had the honeycomb come loose once on a Cherokee I owned.... it rattled around for years. Eventually, it disintegrated and tumbled until it assumed the shape of a ball and plugged the exhaust outlet, lol. Then I caved in and bought a new cat.

[vitaminC]

I had the same issue. Replaced my 2ndry cats with some aftermarket bypass pipes and now the rattle is gone and the car sounds much better! Those cats are not part of the emissions control loop, so they should not affect smog tests- YMMV.