Thread: Did JB4 tune
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      01-06-2013, 07:07 PM   #11
PR3CI5N
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Drives: 2010 E90 M 335i
Join Date: Jun 2010
Location: West Coast

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Must have went wrong on the install at some point or you're not on the correct map. The increase in power is noticeable as soon as you touch the gas pedal. I just installed a JB4 on a members 335i who didn't know much about the tune and he said the he noticed the increase in power immediately. Good luck
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