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After a whole year after removing my RaceChip tune before bring my car into service... I swore there was no real difference, so didn't bother reinstalling it....
Today after giving my motor some cleaning and since I had already removed the airbox and a bunch of stuff, I said hell with it and put the RCU back in.
And yeah there's a difference. No idea about BMS S1, but RaceChip Ultimate very driveable.
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