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From reading the install directions for the flex fuel wires from BMS, all you are doing really is allowing the jb4 to intercept the Fuel rail sensor, which leads me to believe it is able to manipulate your fuel trims by adding fuel by tricking the ECM into thinking you need more fuel rail pressure. You also need to splice 2 wires coming from the TMAP.
So, the proceed and BMS flex fuel kits are different. The proceed actually measures the fuel composition, and the BMS kit intercepts the fuel rail sensor.
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