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      12-11-2012, 08:27 AM   #2
Private First Class
Drives: 2011 335i
Join Date: Aug 2011
Location: Houston

Posts: 150
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If you are installing the flex fuel wires...just do the ISO mod while youre in there. It will take an extra 2 minutes. It makes the car feel so much better. But I guess to answer your question specifically, yes, you do need to at least update the firmware to the 8/17 update.
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