aFe 46-20039 BladeRunner 3-1/2 IN Aluminum Cold Charge Pipe BlackaFe 46 20039 BladeRunner 3 1 2 IN Aluminum Cold Charge Pipe Black Flow and Performance: Constructed of 3 1 2"mandrel bent aluminum tubing for maximum flow then, powder coated for a nice finish. The high temp wrinkle black powder coating also insulates the tubes from engine heat and protects the tube from corrosion The smooth transition bends decrease turbulence and minimize pressure loss, while increasing horsepower and torque. Installs on the Cold