The Alta rear control arms for the 02-06 Mini Cooper S replace the heavy non-adjustable factory control arms to allow for rear camber and toe adjustment. The ability to properly align your Mini cooper is crucial for best performance, especially after adding performance shocks, springs or coilover systems. Alta rear control arms are CNC machined from sturdy 6061 aluminum and heavily powder coated for durability. Fully adjustable and teflon lined spherical bearings replace the mushy rubber factoring bushings at each connection point. This solid type connection still allows for smooth and precise movement of the control arm through a far larger range of articulation. Alta rod ends use injected Nylon around the center of the ball to ensure quiet operation as the part ages. For the ultimate in performance and adjustability, Two sets of arms can be purchased to replace both sets of upper and lower control arms on your Mini. Replacing both upper and lower rear control arms will remove even more deflection from the OEM rubber bushings and reduce even more weight from your Mini. Alta rear control arms include a 5 year warranty on factory or workmanship defects.