Originally Posted by christian370z

These are not true solid mounts due to the polyurethane cores, but my I installed some polyurethane trans and engine mounts in my auto trans Saab and the vibration was fairly bad for the first couple hundred miles before it was completely broken in. After, it was not that much worse than stock and the drivetrain felt so much more solid too.

Then again, the Z is a FAR better car. The stock mounts in this car are actually nicely stiff for N/A applications.