Designed for durability, with a 1.250 stainless steel valve, nomex/silicone diaphragm and with a unique stand- off actuator section, the DELTAGATE can control boost on engines that develop 350-400 HP. With the addition of a Variable Boost Control Regulator (PN 10402) the DELTAGATE is fully adjustable over a wide boost range. ebay wastegate 17-7 PH Stainless Steel actuator spring gives consistent pressure at high temperature