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From what I have read V2 seems to have some very serious boost spike issues for some people, like in the range of 20+ PSI and that V3 is supposed to give more even boost. Among other safety, conveince and power upgrades. Two things that stick out are the ability to change maps between a base and high power map on the fly and the ability to fine tune the map to your own desires, past just adjusting the torque % value.
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