[H2Miami]

Hi guys

Ive notice a knocking noise , it comes from the floor underneath while drive , I was reading that may be the mounts for the exhaust are broken or a problem with the shaft .
It is intermittent , most common while passing around the 45-50 mpg range

I will check the exhaust
Please any advise how to check if there is a issue with the shaft before taking it to the dealer

Any other thing to check ?

Thank you all