The Precision PW66 external wastegate is made from high grade, high temperature stainless steel and billet aluminum components. It features a purpose designed Kevlar reinforced wastegate diaphragm and a 347 stainless investment cast valve body. The investment cast valve body has a smooth internal surface and the largest valve on the market today. This gives you better flow and more accurate boost control. The PW66 features a Nickel Chromium Alloy valve and 5 different 17-7 precipitation hardened springs. Also included are stainless steel inlet and outlet flanges with clamps. With a satin black anodized, 6061 aluminum billet wastegate cap you will have years of good looks and protection from the elements. The PW66 is generally compatible with most aftermarket manual and electronic boost controllers on the market today.