BMW strut towers use very thin steel and can crack when driven under specific conditions (lowered cars, potholes, etc.). A sport suspension (shorter, stiffer springs) or coilovers will transfer road hazards energy directly to the strut tower deforming and causing costly damage.
Your factory strut towers will deform over time (moreso with lowered cars) hitting potholes and metal fatigue. By using this reinforcement (UNDER the tower), you essentially DOUBLE the thickness. Increase the protection even MORE with the addition of our RACEBRACE
These factory plates are sandwiched between the strut mount and body and do not require welding for installation. Sold each.
Notes: There are no applications for the 2007-08 MZ4.