Delrin, like some poly versions, requires some break in time. It will take 150-250 miles for them to soften to their effective hardness. They also require some heat in them to soften up. And on colder days they may have more vibration at start up until driven on for a few miles. They are also self lubricating so they will never squeak.
The Stage II mounts are designed for pure performance, at the expense of ride comfort. They will hold the motor and transmission very securely and help get all the power to the ground. If you drag race or are after total performance, then the Stage II is for you. If you are concerned about vibration, then the Stage I, or .5 are a better choice. Upgraded hardware is included with all kits.
Included in the complete kit is a Stage 2 Delrin transmission mount. This kit contains everyting you need to replace and upgrade ALL of the motor mounts in your MKIII/VR6 Corrado
*FITS ALL MKIII 2.0, VR6, VR6 Corrado
These mounts were removed from a 2.0 with less than 100k on the clock. Notice the mount is noticeably "squished" vs. the stock mount. Over time the weight and movement of the engine can compress the stock mount from 1/4" (shown) to 1/2" – or even more in some cases! Damage tends to be worse on higher milage cars as well as VR6 engines.