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BMS has a Stg 1 plug in - good for about 35whp and a Stg2 beta good for about 60whp.
Lots of folks are running these and the price - about $350 for each stage is a no brainer.
I have been running Stg 1 for over a year. No issues.
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2006 E90 330i (retired)
2009 E90 335i (retired)
2012 E70 X5 50i M Sport (retired)
2016 F10 535i M Sport
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