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      06-16-2012, 08:09 PM   #4
Juiced46
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Drives: 03 Turbo Cobra, 2011 335xi
Join Date: Jun 2010
Location: Wallingford CT

iTrader: (3)

You can program with the JB3 installed. I would just leave it off however just to make sure there are no issues at all.

You can update firmware on the JB3 as well. But the JB4 is much much better.