So my car has started making an interesting noise. After I turn it off I hear a ticking noise from the right rear corner that I thought was the fuel evap canister, but I checked the other night and it’s actually coming from the exhaust system, I think the resonator? It’s the box hanging on the passenger side. If I touch it, the ticking stops. It stops on its own after it cools so I think it has something to do with expanding and contracting with hearing and cooling, but I’m not sure I’d it’s something I need to worry about.

 

I don't think I'd worry unless it starts to sound very loud or the engine seems to run rough. I could be a heat shield or just heat alone that's causing the ticking. Even a pebble in a critical spot can end up rattling or otherwise interfering with the exhaust. A loose clamp or rust can also be culprits. On another topic, I see you have Koni FSD's and wonder how you like them, since I'm thinking about them for my '03S.

 

Metal components expand and contract with extreme changes in temperature causing that. I remember dad's brand new '50 Buick 'ticking' after he shut it down.