Aluminum lower suspension system owner the BACK of this front suspension system. Redesigned to go the internal pivot location closer to the automobile center permitting to make use of longer and faster suspension supply alternatives and new suspension geometry. The narrower design increases back traction. The aluminum suspension system holders feature Integrated Suspension Settings (I.S.S.) that allows for fast & effortless suspension geometry set-up. Machined from premium Swiss 7075 T6 aluminum and black coated. Utilizing eccentric suspension system bushings inserted into aluminum suspension system blocks, alongside additional suspension system shims, the XB4 suspension geometry can be totally modified.