aFe 46-20299-B BladeRunner 3-1/2 IN to 3 IN Aluminum Cold Charge Pipe BlackaFe 46 20299 B BladeRunner 3 1 2 IN to 3 IN Aluminum Cold Charge Pipe Black Flow and Performance: aFe POWER's cold side intercooler tube is constructed from 3 1 2" and 3" mandrel bent aluminum for maximum flow, then powder coated for a an aggressive black finish. The high temp powder coating insulates the tube from engine heat and protects from corrosion. Its smooth transition bends decrease turbulence and minimize pressure loss, while increasing