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It seems that its not straightforward to compare it to the BMS powerbox if I understand correctly.
BMS Powerbox:
- Piggyback style tune.
- Can take it off and dealership wouldn't know you have it.
- Moderate gains.
Active Autowerke:
- Tune is in the ECU.
- Can not be taken off.
- Possibly greater gains due to complete tune?
As for me, honestly, I've never heard of BMS before. Active Autowerke on the other side have been around for a while, and I've read articles and opinions on many of their projects; including an article in a Roundel earlier this year of their supercharger on an M3.
I am excited about Active Autowerke's tune and its on my list to do if the reviews come back positive.
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