Thread: M340i owners with jb4
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      09-21-2019, 06:09 PM   #1
Antec800
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Drives: 340i x drive
Join Date: Apr 2017
Location: Michigan

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M340i owners with jb4
Feel free to chime in, I took the jb4 off my 2017 340 and added it onto my m340 so far it feels a bit faster but the transmission shifting delay on wot is worse then on the f30.
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