Wonder what this might be....c when I park my car after a long drive say 25miles or more, I hear a loud clunging noise.
It comes on 5mins after parking the car and lasts within a sec or two. It sounds like a stone has been thrown at the central part of the exhuast system.

Well I was previously told that metal expand when hot and therefore make such noise.
One that my car makes is louder than normal. Quite loud indeed! Any advise please?
Cheers.