Fox 2.5 Internal Bypass (IBP) Coilovers come pre-tuned from AccuTune Off-Road using AccuTune Equations, and AccuTune Double Flutter Stacks to give you the best performance possible. Fox 2.5 IBP Coilovers offer bypass performance in a coilover package. Fox Internal Bypass Coilovers use a unique design that allows for a high flow piston and tube with reed valves to provide position sensitive damping – just like a 3-tube bypass shock. Whether your limited by class rules or space constraints, Fox 2.5 IBP Coilovers deliver the performance you need. Step-up to Pre-Tuned Fox 2.5 Internal Bypass Coilovers from AccuTune Off-Road and feel the difference.