Thread: JB4 stage 2 on my 640i F13
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      11-25-2013, 12:25 PM   #8
spdrcrgtr
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Drives: BMW M4 Heritage
Join Date: Nov 2012
Location: Los Angeles

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I have the JB4 stage 2 on my 640. I have been running it for about 4ish months now without any issue. Car runs great.
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