Adjust Valving Track-side

QA1 MOD Shock Valve Packs feature multiple valving options to achieve the ideal damping range on their MOD Series Shocks - without removing the shocks from the car! In a matter of minutes, you can swap out the valve packs and change the entire force curves of your MOD Shock.  This revolutionary design has opened the door to a whole new world of quick-and-easy trackside suspension tuning.