The Dinan Tension Strut Ball Joint Kit is designed to replace the soft OEM rubber bushings in the front thrust arms of the M3/M4 with precision-sealed ball joints encased in machined aluminum housing.

The suspension itself uses new front control arms and tension struts. And some pivot points use new swivel bearings that allow for less side deflection. Although the ride height here is the same ...

First we have the Tension Strut Ball-Joint Kit for the front thrust arms and adjustable toe-links with steal rod-ends in the rear. These were the two modifications I thought were mandatory on the M4.