Hi Tony,
The manufacturer i
Hi Tony,
The manufacturer is obligated to examine your cats and determine if the failure is due to abuse or due to other reasons. If you have performed your schedule maintenance (both EPA and ARB are very lenient regarding maintenance) and you have not been in an accident and you have not modified your ECU to gain more HP (i.e. timing and Air/Fuel ratio) you should be covered.
It sounds like the fabric that holds the cats in place has broken loosened the cat in the chamber and that's why you get the rattling noise.
I don't know about the hyper flows but if you ever want to sell the car most people prefer stock equipment to aftermarket. So I suggest at least trying to replace them under warranty (8ears/80K miles). These cats are pretty expensive (about $5k each).
Matt
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