The aFe Power 3 - 12 intercooler tube represents the next generation of Diesel performance products. This intercooler tube transitions from a 3 - 12 diameter to 3 to fit the factory intercooler for an improved response. This kit comes complete with a 3.5 mandrel bent powder - coated stainless steel tube and 4 - ply heavy duty silicone couplings and constant tension T - bolt clamps to ensure maximum performance and a secured fit.