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MS1 suffices for most people. MS2 support for the 420A is limited at this point, so while it has more features, there's less resources to use while installing and tuning it. Do you just need to control fuel and spark, or do you want to completely replace your stock ECU? You can do either with both MS1 and MS2, but it might be a little easier with MS2 once its more thoroughly developed for the 420A.
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-Paul
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