Car has very loud engine noise / exhaust pipe issue? muffler issue?

Maintenance/Repairs
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3

I have an RX300 that had both studs break that hold the O2 sensor (under driver seat) to exhaust pipe. This leave a 1" “hole” that will make a bunch of noise. Easy to fix with 2 U-clamps, and some high temp gasket material. Dealer only wants to replace the cat. You’ll have to to find a local repair shop to do this.