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Nice writeup. I used a JB+ on my F30 340i for around 2 years and I think it added a good amount of power but I can't get it to go past the 12 o'clock position without it causing shift delays. I think I got a check engine one and it was for an overboost code but I cleared it and haven't had problems since. Also being so easy to install/remove was great whenever I had to get the car serviced.
I haven't tried it with my M340i yet but I might give it a go and see how it does. I went to the drag strip a few weeks ago and my times were around 12.05 @ 113 on the 1/4 mile so if this can push me into the 11s that's be so cool!
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Current: 2020 M340xi
Previous: 2016 340xi
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