BMR Suspension S550 Mustang Differential Bushing Lockout Kit is designed to decrease differential bushing deflection in order to enhance the rear stability and minimize wheelhop in 2015 and newer Mustangs. The stock rubber bushings have large voids built in to dampen road noise, vibration and harshness (NVH) but do nothing for performance. These kits feature red polyurethane or black anodized billet aluminum plates that are manufactured to exact tolerances to install over the factory bushings to decrease pinion rise and differential movement while the NVH is nearly unchanged. This all adds up to a product that increases performance, adds strength without a significant weight gain and installs easily since they are a perfect fit.