Viking Performance, Inc. specializes in high performance shock absorbers and struts, high travel coil-over springs, rod end and spherical bearings, and related items. Viking was founded in 2011 by owners with more than 50 years of hands-on experience in the racing and performance aftermarket. Viking Performance Shocks for the Ford S550/S650 Mustang with Crusader Valving are designed for heavy duty race applications. These shocks are internally valved for Small Tire Drag Radial applications where a finely tuned shock and suspension is required. With over 418 total combinations of adjustment in rebound and compression, this shock will take your ride to the winners circle and back again.  Viking Premium Features Fits All 2015-2024 Mustang S550/S650Standard Ride Height 0-2" LoweredDrag Race 600+HP Small Tire/Drag RadialRebound Valving: "M" Medium FirmCrusader 418 Valving Combinations for Infinite AdjustmentsNo Special Tools Required for Adjustments Crusader Shocks offer 19 positions of evenly spaced adjustments, the zero position and 18 distinctive clicks. The rebound valving, however, is a progressive valve that is strictly determined via orifice control. A progressive valve shock will have a softer low speed force that ramps up very quickly as shaft speed increases. Do not let the definition fool you, as these shocks can generate huge forces at low speeds depending on the needle and seat combination. In fact, the Crusader� shock absorbers produces forces far greater than nearly all other shock absorbers on the market. The rebound side has 22 available positions of adjustments, the zero position and 21 distinctive clicks. As a result, the Crusader� line provides for 418 different valving combinations. This needle and seat combination allows for a very large adjustment range.