The Yeah Racing Qutus (Quick Tuning System) dampers let you adjust the damping action swiftly, without disassembling or changing oil. Customize the dampening by using the included adjustable pistons, with 1 to 5 holes open for track-specific tuning. The D-Bore system features drift-tuned springs in soft and hard variations, ideal for low and high grip surfaces. For those preferring traditional fixed pistons, three variants are included. The updated 'big-bore' shock body ensures consistent handling in varying temperatures.