CNC billet aluminum T6061 housing for heat disbursement 2 Bolt Flange set up for Turbo Applications. Inconel Base Housing with Forged Stainless Steel Valves Construction Heavy Duty Actuator Diaphragm withstands Temperatures up to 490 Degrees Celsius High Temperature Silicone Reinforced Actuator Diaphragm Inner Design Weld-on Flanges are Included with Every Kit. Super Ribbed Design. Wastegates includes Steel Hardware Bolts. Boost Adjustable with use of any High Performance Boost Controller. External wastegates are commonly used for fast spooling and keep back pressure to a minimum and still regulating boost levels more precisely than internal wastegates in high power applications, where high boost levels can be achieved.