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Seems to be a more developed product than the BMS that only increases boost and is still set up for the N63 engine and MAP sensors (you have to use the "wrong" settings to achieve the boost gain you want).
Here the piggyback controls fuel, ignition and boost.
This one comes with factory connectors as well. No need to splice the wiring.
This is basically the same as what Hatge, AC Schnitzer etc does as well. They have a track record if you are worried about it, but that comes at a price...
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