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Hey mate. Do you mean 'blew' your cat as in the actual guts blew out? If so then your exhaust became more free flowing and would have been a free performance upgrade.
Your new cat is restricting flow compared to the old one that was probably disintegrated.
Get the exhaust shop to delete it (replace it with a straight through pipe) to get your sound and performance back.
I run UELs and a Q300 and no cats.
Sent from my SM-G973F using Tapatalk
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