All my experience with rubber vs. polyurethane is limited to suspensions from 30+ years ago, so it may not apply to modern materials or exhaust mounts.
Polyurethane is considerably harder than rubber - great for a where you want less slop, but it conducts more noise to the frame and cabin. If you want to minimize exhaust system movement and don't care about noise, polyurethane is the way to go. If you are more worried about cabin noise, buy the rubber bushings by the dozen and replace as needed.
It will probably be considerably more difficult to install the hanger into the bushing if you use poly.
YMMV
|