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      12-09-2012, 05:35 PM   #65
RollingLower42
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Drives: 2012 BMW 335I
Join Date: May 2012
Location: Los Angeles

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I am thinking about getting JB4 stage 1 for my 2012 335I F30.

I am looking for reviews from people with previous model 335's. I am just curious if everyone that had JB4 was still happy with it and had no problems...I hear rumors that running JB4 is bad for your engine, but I do not know if that is true or not..