How bad is vibration with poly mounts?

[Jicaju]

Just wonder how bad vibration is with poly mounts? Will my teeth chatter? Reason I'm asking is I read the advertisement from H&R and it says they will give 1/4 inch extra clearence over stock mounts. If so then I should not have to dent HDP correct? Therefore if the vibration is not that bad and if I don't need to dent HDP I hate to install NAPA mounts now only later to wish I would have put in the poly.

 

[sdteb]

poly

i put them in my gn....there is a noticeable difference...however the motor no longer moves as much...the tta has stockers...

www.shandy.com/gn/dyno

for dyno vids of how much the motor movess now...