WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.
Check exhaust pipes, muffler and mounting for improper attachment, leaks, cracks, damage or deterioration.
If anything is found, repair or replace damaged parts.
Fig 1: Checking Exhaust Pipes, Muffler, And Exhaust Mounts