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You can send them ECU, and they can remap it for you remotely.
I considered before to do this, but I'm happy with present piggy back solutions on the market as I have one myself.
If I still had my F20 116i, I would send it straight away, as power difference is massive what they can extract from it!
But for N20 it doesn't look like that, and it's still on current piggy back range.
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