Hi when cold and until warmed up there is a metallic vibration coming from the right side muffler. It only happens when revs rise or fall below 2k rpm. It sounds like it comes from the muffler. Once the car warms up it goes. The sound is like a metal thin plate flapping in the wind or like a duck whistle. Ie not a ticking but more a vibration.

And I swear it only happens when the car has been washed and water enters the exhaust via the jet wash.....

Anyone else have this issue?

 

No one?

 

sound like the heat shields?