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I have BM3 and Ive only used it to flash out the cold start so far as I’m still deciding what time to go for. But my understanding is that if you use one of the OTS tunes then there should be no need for data logging, CEL lights or anything untoward. If you request a custom tune then yes you may need to do that. But that’s as you’d expect anyway. It seems the best of both worlds with BM3. But this is subject to the OTS maps being good, which I’ve heard they are but not tested first hand yet. I’d only be looking for the stage 1 map myself.
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