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For Subaru WRX’s utilizing the stock 0-5 volt output MAF sensor. Also works on STi’s. The Digital Variable Control unit proportionally injects more or less water-methanol according to input signals from the mass air flow sensor. More power over a wider range and better drivability is the result. 20% increases in Horsepower typical.
*NOTE* It is recommended that a Solenoid Upgrade (#40060) be used in any application that utilizes a trunk mounted reservoir.