Did this when I put In my 6 speed (still on r160) to prevent any sort of premature diff failure (not sure if it actually will) and I got it for a stupid good price. GPN motor and trans mount, all other driveline and shifter bushings aswell so it was quite different than before. Increase in vibration and nvh for sure IMO. I get a whining sound at all speeds I assume from this stuff, no big deal as long as I know nothing's wrong.
Haven't been able to go on the twists with it yet as it got too cold too fast.