Fits: All F2X 1/2 series & F3X 3/4 series BMW's Benefits:- Solid mounts the rear subframe to the chassis (Braces the chassis)- Stiffens the rear end feel (driver feedback)- Provides consistent suspension geometry (stability)- Increases driveline stiffness (control)- Raises the subframe to improve roll-centre & anti-squat geometry (more grip)- Puts the suspension closer to its designed operating range on lowered cars reducing bump steer, camber change etc (stability)Note: Solid mounting the rear subframe will not increase NVH if using stock diff bushings. Material: - 6061-T6 Aluminium - Anodised Purple Recommendations:- Pair these with our Front Roll Centre & Bump Steer Shims to improve front kinematics to match! We consider solid subframe raising bushes an absolute must for all F2X & F3X BMW's due to >42% of all the spring force pushing on the subframe causing massive deformation in the stock rubber and some poly bushings. Every bit of flex from driveline torque and suspension loading causes a change in geometry making the back end vague, numb & unpredictable. These bushes make the back end feel tight, rigid and responsive improving the control and feedback to the driver for a superior driver feedback and stability just like the F8X M cars of this generation! If you'd like to know more about this product, Click Here to see our tech article