Bimmian BARZ4AGYY Mechunik Strut Bars For BMW Z4 E85 & Z4M E86 - Beryllium Type - Mechunik Strut Bars. A strut bar is designed to reduce this strut tower flex by tying two parallel strut towers together This transmits the load of each strut tower during cornering which ties the two towers together and reduces To accomplish this effectively &#40;especially on MacPherson strut suspensions&#41;&#44; the bar must Mechunik strut bars are made from dense&#44; light weight aluminum to maintain structural rigidity throughout