Proven Off-Road Excellence. Daily Comfort. The Fox Performance Series IFP Front Shock offers legendary Fox performance as a direct bolt-on replacement. Engineered for GM HD trucks, it enhances ride quality, stability, and control on and off-road. Whether daily driving or off-roading, IFP technology maintains consistent performance by preventing oil aeration. It's the ideal upgrade for trucks with factory suspension or moderate leveling kits, providing improved damping and extended lifespan over stock shocks.