UMI Performance 05-14 Ford Mustang Boxed Lower Control ArmsMIs heavy duty boxed control arms are built from oversized North American boxed steel tubing, thick wall bushing holders and the highest quality polyurethane bushings. This heavy duty set up is designed to replace the factory set up minimizing wheel hop while helping track consistency. Aftermarket control arms eliminate flex and bushing deflection found in the factory lower control arms but replacing flexible steel with boxed construction and rubber