This 4.5" System for the 2011-2016 Super Duty is one of the best riding suspension systems ICON has ever developed. This system has been engineered using the highest quality materials and components. The dual rate front coil springs combined with our ICON 2.5 Aluminum Series shocks give these trucks the performance they so desperately need. This system comes complete with front coils shocks radius arm drop down brackets rear blocks U-bolts and our patented adjustable track bar with upgraded bearing giving the front end of these trucks perfect track alignment. The Stage 3 system also upgrades the front and rear shocks to our 2.5" Aluminum Series piggyback reservoir shocks for even better ride quality and performance.