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Originally Posted by J. Dub
What is the reason in updating? What benefits do you attain?
What if you are running a custom tune?
I guess I don't understand this thread.
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231E software onwards from 2010 / 2011 M3's reportedly gained 20hp more than the previous versions on 2008 / 2009 cars...
Not personally tested but that's what many people reported.
If you are running a custom tune already then you won't gain anything...