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Boost Referenced Progressive Controller

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03. The boost-referenced progressive controller gradually adds more water (injected into the air intake) as the boost pressure increases. The kit starts injecting water at a working pressure of 15 psi and keeps injecting more until it maxes out at 25-psi (still injecting, but does not increase amount of injection). Since the kit is CARB legal, the controller is a fixed unit that has no adjustability.