It's the rubber mounting arrangement for the bevel box. Introduced as standard at the start of 2014 if I remember correctly. It was meant to reduce bevel box noise but seems to be fairly ineffective and may cause hassles due to the bevel box moving about a bit that the earlier rigid mounts didn't have.
I wouldn't worry about adding the NVH kit if it doesn't have it but what it does indicate is a car with one of the earlier chassis which would have come from the factory without the welded in diagonal braces behind the motor. If so it should definitely have the bolt in diagonal braces in the same location. If it has the welded in diagonals then the chassis has been changed which is basically a good thing and it may or may not have the NVH bits - there were a few chassis that made it in to the wild with the bracing but without the NVH.
I'm told that fitting the NVH kit involves welding brackets to the chassis.
I believe Phil Bleazey is doing a kit to convert the rubber mounted bevel boxes to rigid mounts. This might tell you how critical an upgrade the NVH kit is and overall I wouldn't be too worried about it.

Calum
M3W Vol1
Vol2