The EX44 features a 44mm valve and comes standard with 15psi springs installed (1 x 10psi outer and 1 x 5psi inner spring). By removing one or the other spring, you can achieve base boost pressures of 5psi, 10psi, or 15psi. Also available is a 7psi middle spring, which can be used in various combinations with the supplied spring to achieve base boost pressures of 5, 7, 10, 12, 15, 17, and 22psi*.
 
All GFB wastegates feature an investment cast body made from 253MA chromium-nickel stainless steel, a CNC machined billet stainless valve, and all stainless steel weld-on fittings and hardware, whilst the diaphragm is nomex-reinforced silicone. All this adds up to a wastegate built to handle extreme conditions with reliability you can trust!