Originally Posted by Bram

I sent these pics through to your phone. But thought id put em here aswell for others to see. 3 of them are welded on. And there is 2 lighter bolt-on rubber lumps aswell. From what i can tell, they serve no real purpose besides possibbly added mass for NVH absorbtion.

2018-06-28_06-15-43 by bram biesiekierski, on Flickr

This one is probably the biggest and easiest to do. The lump sits real close to the driveshaft uni / diff. So i guess its there to soak up any minor imbalance.
2018-06-28_06-15-32 by bram biesiekierski, on Flickr

2018-06-28_06-15-54 by bram biesiekierski, on Flickr