Aluminum lower suspension system owner the BACK of back suspension system. Redesigned to move the internal pivot location nearer to the car center allowing to make use of longer and reduced suspension system supply options and new suspension geometry. The narrower design increases rear traction. The aluminum suspension holders function incorporated Suspension Settings (I.S.S.) that allows for quick & easy suspension geometry set-up. Machined from premium Swiss 7075 T6 aluminum and black colored coated. Making use of eccentric suspension bushings inserted into aluminum suspension system obstructs, alongside extra suspension system shims, the XB4 suspension system geometry can be totally modified.