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I disconnected the Jb4 and the car runs much better,no power loss,smoother,less fuel consumption ,my local
shop is trying to work it out with ESS because I understand they listed all my mods including my JB4 + BCM to ESS for me and my friend here DrM5 which had the same issues and fault codes as me.ESS should have offered the backend flash only instead of the full ECU flash knowing about the use of JB4.Local tuner says much more power to be made with the jb4 and the backend flash so I want to switch to that
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