FOX Factory Race Series 2.5 Internal Bypass shocks for the Toyota 4Runner deliver velocity and position-sensitive damping technology, Dual Speed Compression (DSC) adjustment, and high-speed ready performance in a bolt-on kit. Patented Internal Bypass technology allows for multiple zones of damping control. The result is a comfortable, confident ride with increased damping capacity through rough terrain. Internal bypass shocks produce more force progressively to control hard bottom-outs, prevent harsh top-outs, and provide an initial catch for landing. Shock fluid bypasses the main piston through a series of bleed holes in the ride zone. As the shock extends past the ride zone in rebound or compression, the bleed holes terminate, forcing fluid through the main piston. Type III anodization prevents corrosion and wear of the 2.5-inch diameter aluminum bodies. Dial in your 4Runner for load, environment, and driving style with the DSC adjuster. External reservoirs increase oil capacity and house an internal floating piston (IFP) to separate the shock oil and nitrogen charge, maintaining consistent damping and keeping shock temperatures cool. Experience the support and confidence of FOX Internal Bypass shocks you need while driving high-speed through rugged terrain.