The Aquamist HFS-2 is based on the hardware of the HFS-3. The HFS-2 deletes the flow sensor and gauge to provide a basic PWM injection system. For applications where a stealth install and failsafe features may not be necessary this is the best system available. At any time after the purchase of the HFS-2 system one wishes to upgrade to the HFS-3, an upgrade kit will be available from the factory. To upgrade, simply plug the flowsensor into the WFS port on the controller, plug the gauge into the Gauge port(remove button) and attach the flow sensor to the FAV and the transformation is complete. It has never been easier to get a full featured water injection system at this low a price.
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