Aluminum reduced suspension system holder the rear of this back suspension system. Redesigned to maneuver the internal pivot location nearer toward car center enabling to utilize longer and smaller suspension system supply options and brand new suspension system geometry. The narrower design increases back traction. The aluminum suspension system holders feature integrated suspension system Settings (I.S.S.) makes it possible for for fast & effortless suspension system geometry set-up. Machined from premium Swiss 7075 T6 aluminum and black colored coated. Using eccentric suspension bushings placed into aluminum suspension system system blocks, along with additional suspension system shims, the XB4 suspension system geometry are entirely modified.