Wehrli 01-04 Chevrolet 6.6L LB7 Duramax Fuel Pressure Relief Valve Delete KitKit to remove the the High Pressure Fuel Relief Valve located on top of an LB7 intake runner to clear larger Y bridges. This Part Fits: Year Make Model Submodel 2001 2004 Chevrolet Silverado 2500 HD Base 2001 2004 Chevrolet Silverado 2500 HD LS 2001 2004 Chevrolet Silverado 2500 HD LT 2004 2005 Chevrolet Silverado 2500 HD WT 2001 2004 Chevrolet Silverado 3500 Base 2001 2004 Chevrolet Silverado 3500 LS 2001 2004 Chevrolet Silverado 3500 LT 2004