replaced one catalytic converter and now the second one is making loud noise. on 2005 Ford Crown Victoria

only has 64,000 orig. miles
Is it still under warrenty

i do belive fed law is 70k miles or 7 yrs you might be under warrnty. call the dealer
Thank you so much for the quick response. I'll check it out.
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1 more answer , 1 more comment
Your car is equipped with two coverters on each side (4 total) was tthe 'one' that was replaced done at the dealer or did an aftermarket shop cut and weld in a single converter to one of these assemblies? if that was done , it may void any warranty (at least on the affected side).Good luck.
The dealer replaced it. Thanks for your response.