Solid subframe bushings E46 Z4 Puretech Black

Solid subframe bushings provide a rigid connection between the subframe and chassis. This ensures that chassis can take advantage of the rigidity of the subframe for a more rigid assembly, but also that the subframe does not tilt relative to the chassis under load, allowing those wheels to stay nicely aligned.

Mind you, these subframe bushings can create more noise and vibration in the car so for a comfortable street car it may not be ideal.