Installed JB4 and now getting 30FF
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11-16-2012, 04:50 PM
BimmerPost Supporting Vendor
Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
Rather than spending the money on a dyno you should spend it on a mechanic to fix the car.
30FF is boost leak. Since you bought the JB4 used it could just be damaged or something as well.
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