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Unfortunately my experience is quite the contrary. I have installed the JB+ since I got the car and now that it has around 500km on the clock, I took it off for service. As soon as I uninstalled it, I noticed the car runs smoother and the jerkiness at low speed is gone. I am not sure about the power gain/ loss as mostly I do is city driving here in Hong Kong. Then maybe some loss but not sure if it’s just placebo. However the improvement in smoothness and responsiveness is definitely here. I’m wondering if the JB+ works differently on the 320i I got compared to the 330i?
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