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Discussion Starter · #1 ·
I am getting a lot of unflattering noise from my exhaust. I have stock Manifolds w/ cat, 2.5" in exhaust with x-pipe. LT1 engine.

Does anyone know what a bad catalytic converter sounds like? does it have a distinct sound I need to be listening for? I ask because I currently hear a sizzle from under the car, almost like water on really hot metal. The sound is off an on but fairly consistent and fairly annoying.

I was told about 6 months ago I had a Catalytic Converter going bad. I live in CA so I must replace. But I don't want to if a bad cat isn't the cause of the noise.

Any help, would be appreciated.


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