Steve, I’m considering jumping to Turbosmart. It’s looking like a well designed product. Sadly, it’s diaphragm, not piston. Maybe my Forge unit with 13 psi crack will be fine, but I’m going to talk that over with Toby.Another example of how Forge themselves are screwed up. And @sharkcohen may be right. I ordered my WGA directly from forgemotorsport.com and the box says FMACFPEVO-US on it. I know the WGA I received does not accept the larger 048 spring, only the 049 spring. When I contacted them directly about the inability to set crack pressure below 13 PSI with the yellow spring they argued with me why I would possibly want to do that if I'm running 25 PSI boost. They insisted I should have a crack pressure of 25 PSI! The guy finally gave up and said he was putting the green spring in the mail to me. Maybe Turbosmart knows what the **** they are doing?