The Stage 2.5 uses the progressive VC-50 controller (52mm Gauge) that proportionally injects more or less water methanol according to boost pressure. Start and full points are adjustable for engagement and delivery curve to match what the engine requires. Proportionally injecting according to boost pressure gives an accurate delivery of water methanol and allows cooling and performance improvements over a wide range for improved drivability. The Stage 2.5 Boost Cooler will make the induction charge colder, denser, and increase 91 octane fuel to 116 octane race gas levels allowing full power all the time! The VC-50 controller offers the functionality of a boost gauge and water methanol controller all in one! Highlighting a bright 7 color (Blue, White, Red, Yellow, Orange, Purple, Green) O-LED screen displaying boost, percentage of injection, low level, secondary stage activation, prime button, and system fault codes directly on the screen. You can tailor the controller color to match your OEM gauges or mix and match up to two colors! This kit utilizes the only OEM approved water methanol injection pump on the market with proprietary heat flange, twin seals, and custom motor winding to run cooler and longer than the competition. The Extreme Environment 300 PSI UHO pump is designed to be in the elements with O-Ring connections that are then sealed and potted to ensure no moisture can enter the pump internals. The Stage 2.5 comes standard with 100% methanol resistant components using stainless steel, nickel plating, EPDM, and hard anodizing to ensure years of continued use.