just had my cat replaced on my 02′ impala (3.8). ever since then it’s been making this weird noise, like a crappy exhaust system. best way to describe it is, it sounds like someone blowing in the top of a milk jug. it only does it when the car is idle, first accelerating, and cruising at about 60 mph. also, doesn’t do it in correlation to moving the steering wheel, so not likely bearings. please help!
You may just have an exhaust leak… take it back to where you had the converter installed and let them know you think it is leaking. The converter is part of the exhaust system.
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