Clicking noise - Catalytic Converter

[ZeroChalk]

I got in to an accident in March - where there was some damage done to the underbody. I've since had the vehicle returned from the bodyshop but my car makes a clicking noise after I shut off the engine. It's not a few clicks but constant (so much it sounds like a bomb) - goes away in 15-20 minutes.

I talked to the bodyshop and they said it was the catalytic converter (which I sorta agree). I don't ever recall it being so frequent ... Is there a problem with it, should I get a second opinion?

I just had an emissions test and I passed.

[Noisy Crow]

Probably exhaust cooling noises. If it bugs you enough have the shop check that the exhaust components all line up properly, and that the underbody bracing is properly tightened. A couple of the braces pass under the exhaust and as a result get quite warm... and if they are not tightened properly they might be able shift slightly as they expand and contract, which can result in a noise.