uhh..just to clear some things up urethane motor mount allow you to feel more vibration during idle and only really helpful on manaul car for when they need to neutral drop. it will prolly help out auto's but not by much.
its much more beneficial than "a neutral drop"
I agree dont put this on an auto, others on NCorg have and take it off immidately--very bad thing.
on the manuals since i've been running with a polyurethane mount for close to 6months. and now a back one for a week I have some experience with this.
As soon as I polyurethaned my front mount, I noticed High rpm shifting was insanely better. The feeling I used to have of forcing the tranny into gear was gone and it felt more like I was just guiding it into gear. You can equate it to normal shifting at around 3K with a filled mount feeling the same shifting around 8300 rpms.
Not to mention you get way quicker throttle response, since all that torque goes to the wheels, not rocking the motor backwards.
Vibration is very tolerable, and wont rattle your fillings out of your back teeth.
its only noticable at idle at a stop and its not very hard at all to forget about it.
It will also aide in launching your car, helping to get rid of that pesky wheel hop we all know and hate!