AWR builds a variety of Urethane Engine Mounts.
Many factory engine mounts are too soft, in an effort by the factory to control vibration and quiet the interior of the car. In addition to using soft rubber, some mounts are liquid filled or have holes cut in the rubber to make them even more flexible.
The downside to these soft mounts is driveline lash. You step on the throttle and some of the torque is used to twist the engine in it's mounts, rather than going through the driveline to the wheels. With AWR's urethane engine mounts, you'll benefit by reducing or eliminating driveline lash, as well as by receiving better throttle response. Instead of wasted torque turning the engine and trans in their mounts, the power is put to the ground right away. Urethane Engine Mounts from AWR benefits both street and track cars.
In some cases AWR simply replaces the stock rubber with urethane inserts utilizing the stock metal mount casings. In most cases however, AWR completely fabricates their own, highly reinforced new metal mounts with urethane inserts with various hardnesses.
Urethane mounts are a great way to control driveline lash. The mounts are usually available in different durometer ratings (hardnesses) in 70, 88, and 95, depending on application. 70 is the softest of AWR's urethane mounts, though still offers much improvement over the stock rubber mounts. 90 durometer is the stiffest offered.