How is this different from the standard UUC Transmission Mount?
The standard BMW bushings and the standard UUC bushings do not have a continuous bolt. Despite appearances, those bushings actually have two separate threaded rods within the bushing material. While this is an ideal design for a street car, a race car has different requirements. Noise and vibration isolation are not race car priorities and are happily swapped in favor of a stiffer and stronger design.
The TM-R meets these requirements with a stiff urethane and strong single bolt that will not allow the bushing to pull apart or break, regardless of how much powertrain torque is applied.
Fits:
E46 1999-2005 M3, 330, 328, 325, 323
E36 1992-1999 M3, 328, 325, 323, 318
E34 1989-1995 M5, 540i, 535i, 530i, 525i