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The AEM Water Methanol Injection Controller is a progressive type controller. This means that fluid will be injected in proportion to the amount of boost that is detected by the internal MAP sensor. In other words, more boost equals more fluid. It is therefore imperative that the vacuum/pressure connection be made properly and securely or vehicle/engine damage could occur. In addition, the controller will automatically compensate for any fluctuations in battery voltage variations to ensure consistent flow under all conditions.