I'll spare you the effort. The butterflies close when vacuum is sent to the diaphragm. There is no way they would close under boost. They butterflies will function normally under boost, even if you're seeing positive manifold pressure at a low rpm when they're supposed to be closed. They will stay closed, due to vacuum sealed between the valve and the diaphragm. When the solenoid valve opens and sends manifold pressure to the diaphragm, they will open. I had the 2 stage manifold before I upgraded to the aebs typhoon, controlled by an msd rpm activated switch. The 2 stage is garbage.