Back box exhaust metal vibration sound. Kuro edition 2013, 2.0 litre NC 3.5

Technical Area Engine, Transmission, Exhaust etc
1
  1. My model of MX-5 is: NC 3.5 Kuro edition 2.0 litre
  2. I’m based near: South London
  3. I’m looking for technical help or recommendations on: back box exhaust metal vibration sound.
2

Have you positively identified it as the back box and not the heatshield half way along the mid pipe ?

3

No, nothing confirmed. It does sound like some loose heat shield. Thanks, will get it checked.