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yep, 12V fuel mod is just to bypass the fuel pump ECU that controls low engine speed fuel pressure on the stock engine. It is not involved with fuel cut as that is controlled by the engine ECU. As mentioned before you will need an FCD to bypass this.
If you decide to do this, I would bypass the OEM fuel poump relay all together. I would run a 8 or 10 gauge wire to a seperate relay and call it the day. trigger it on with a seperate source when key is turned. JMO..