Originally Posted by bardabe

Driftfreaq mounts are really some of the best, only thing is you have to manage the heat on that exhaust mount well so you don't melt it. Otherwise your best bet will be a set of nismo mounts.

Cusco / Kazama mounts are pretty stiff, even my Z32 had gnarly noise and vibration cause of how solid they are.

Originally Posted by Kingtal0n

Theres lots of things you can do besides the engine mounts.

Nismo are great start high quality
I would also suggest an engine damper or engine brace.
Although this might seem like it will enhanced vibrations through the chassis,
it will help keep the engine from moving which will decrease the frequency range of transmitted noise, and it will also improve transmission engagement (manual trans) if you can hold the motor still during shifts (that slight wiggle between shifts with poor engine mounts causes mis-alignment and works the synchros harder IMO)

You should also make sure the idle timing/tuning is suitable for smooth operation (if it has big cams use a bit more timing and a slight rich a/f ratio like 14.2:1 instead of the closed loop 14.7)

Next you can pad or buffet areas of the car using sound deadener (like dynamat?) simply putting that stuff over the metal areas of the engine bay and interior will help absorb vibrations and make the car quieter

From there make sure the trans mount is fresh and strong, make sure there is a downpipe support both above and below, all exhaust hangers are fresh, the little rubbers all over the car make a huge difference whether they are in the engine or not.