Viking's specially valved double adjustable rear shocks are designed to optimize performance during auto-x and road race events. These shocks feature 19 independently adjustable compression and 22 rebound settings, offering a total of 418 possible valving combinations. They are a direct bolt-on replacement for your vehicle, with no tools required for optimization for street, auto-x, or road race. Each shock is built, dyno tested, and serialized in Lakeville, Minnesota. Additionally, shocks can be rebuilt at Viking or an authorized Viking rebuild center.