Not sure what car you are working on, but my 2 cents is put the factory snubber on. My E-body is pretty low and over some higher speed bigger highway bumps the suspension movement allowed the driveshaft to hit the tunnel just barely, not quite enough to get down to the metal but enough to leave a mark in the paint on the driveshaft. This would not have happened with the factory snubber in place, and I installed it now to prevent this in the future. Rear suspension is Reilly Street Lynx.