Here at Inline Four, we've been trying different configurations of polyurethane stiffness in mount kits and we've come up with a cool solution. You can still run the standard 60A polyurethane stiffness in the driver and passenger mount, but for the rear mount, GO SOLID! This will help reduce just about any engine movement, since the rear mount takes the most abuse and you don't have to run all 3 solid, just the rear mount. This will induce more vibration, when compared to a standard 60A rear mount, but then again, it is expected with something solid. It's not as violent of a vibration as if you had all 3 solid mounts. This works well for those who expect the vibration and track their cars. Just another option for those looking to push the edge.
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