Thread: Jb4 increase has mileage
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      05-10-2012, 10:28 AM   #1
Sandeepgill2011
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Drives: BMW 335xi downpipes and colair
Join Date: Apr 2012
Location: Roseville

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Jb4 increase has mileage
I have a 335xi and am
Going to install a jb4. Will it increse the gas mileage if I'm
Driving normally??
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