Team Z Motorsports has taken the race proven design of our S197 Double Adjustable Street Beast Upper Control Arm and made an Extreme Duty version to handle high horsepower applications for your stock suspension 2005-2014 S197 Mustang. Our Extreme Duty Upper was designed to reduce flex and wheel hop, allowing you to transfer even more power to the ground. Constructed from Chromoly 8620 CNC laser cut steel, CNC formed and machined in house to provide quality to match the performance. Inside the body mounted side, we have made a Chromoly 8620 sleeve that is encapsulated between two COM12 Bearings to spread the force and transfer more power. These uppers in conjunction with both styles of Upper Body Mount Brackets offer the most extreme performance, both on the street and strip! They are powder coated in a silver hammertone finish with zinc plated Adjusters for corrosion resistance and quality appearance. Proudly made, assembled, and quality checked in Detroit, Michigan.