Quote:
Originally Posted by Antec800
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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Most likely because it's not optimized for the 2020 M340. I keep saying this, while it's fine to transfer the JB it's not optimized for it. That's literally why there will be a new one. I'm holding out still.