2 Bolt 38mm WASTEGATE / 347 Stainless Steel Alloy is used for Wastegate valve and valve housing / High temperature silicone Nomex reinforced actuator diaphragm. / 17-7 PH Stainless Steel actuator spring gives consistent pressure at high temperature, resists "relaxing" at temperature to 900F (483C). / Nitronic 60 Stainless Steel is used for the valve seat, and valve bushing the same material used in the higher level gates for reliability and longevity. / CNC Machined 304L 12mm thick weld flanges.