The aFe Power 3-1/2″ intercooler tube represents the next generation of Diesel performance products. This intercooler tube transitions from a 3-1/2″ diameter to 3″ to fit the factory intercooler. Perfect Fit: Tube comes complete with 4-ply heavy duty silicone couplings and constant tension T-bolt clamps for a tight and secure installation.Flow and Performance: The intercooler tube is constructed of 3.5″ mandrel bent powder-coated stainless steel tubing for maximum flow. Smooth transition bends decrease turbulence, increasing horsepower, torque and reduced EGTs.Installation is a Snap: Utilizing the factory mounting locations provides stability and a hassle-free installation.aFe Badging: Unique stainless steel laser-cut aFe Power logo plate is welded-on for an aggressive style.Note: This intercooler tube only works with intake manifolds that have a 3.5″ diameter.*Legal in California only for racing vehicles which may never be used upon highway.