In my previous car I had changed the rubber/foam stock engine mounts to polyurethane. It did make the idle a slight bit rougher, but it made a huge difference for driving responce. Essentually, the poly bushings eliminate engine rock, which reduces wheel hop, allows the changing of gears to be smoother, throttle responce was improved, and a few other smaller benefits. I know it sounds nuts that the little pieces could make such a driving difference, but they sure did. I have searched around the net to find something like this for our cars, but with no results. I think this would be a perfect new product for the v6pstore! Can anyone else share their experiences with poly engine mounts?