2017-2025 Superduty Front Shock 4-6" Lift (987-24-020)FOX 2. 5 Performance Series HTO shock is a bolt on shock loaded with position sensitive technology, vehicle specific valving, and larger pistons to improve on and off road performance. A type II anodized aluminum body efficiently dissipates heat and prevents corrosion. The 2. 5 inch shock body features an internal floating piston (IFP) to separate the shock oil from the high pressure nitrogen, optimizing damping. Hydraulic Top Out (HTO) technology