The 7001 wastegate features an investment cast body made from 253MA chromium - nickel stainless steel, a one - piece stainless steel valve, and a nomex reinforced diaphragm to cope with the extreme conditions and harsh environment of high - boost and exhaust temperatures. 50MM VALVE, V - BAND INLET AND OUTLET, 133MM OVERALL HEIGHT, SUPPLIED WITH 13PSI (OUTER) SPRING, ADDITIONAL SPRINGS AVAILABLE ARE 7PSI (INNER) AND 9PSI (MIDDLE), COMBINE SPRINGS TO ACHIEVE BASE BOOST PRESSURES OF 7, 9, 13, 16, 20, 22 AND 29PSI,