Inspection After Removal

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the exhaust downpipe, exhaust insulators, and the flex joint for any cracks. Replace if any cracks are found.
Inspect the exhaust downpipe for any engine oil or coolant.
If a trail of engine oil or coolant can be seen exiting the turbocharger outlet, steam clean the exhaust downpipe.
Inspect the V-band clamp for any cracks or other damage, and replace (if necessary).

Courtesy of NISSAN NORTH AMERICA, INC.