This Whiteline Rear Subframe Bushing Mount Kit for the Subaru WRX / STI has been designed to reduce excessive movement in the subframe under high-performance driving conditions. Your rear subframe is mounted on rubber bushings which over time, can become weak and cause movement in the frame under high cornering loads. In this kit, Whiteline supplies low compliance polymer bushings to remedy the situation by locking in the frame position and removing the lateral walking which can be common for those equipped with high grip tires. These bushings have soft "stand-off" bushing movement of the subframe which will eliminate the solid feel and will provide an additional cushion over minor bumps along with solid positive location when high power is applied. This is a complete set of bushings that will come ready to install.