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Originally Posted by minime388
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I have JB+ on my 35i. Install is very easy but make sure the negative battery is disconnected or else you might short something (I did). Power increase is nice and noticeable. I don't downshift as often now on the highway and the car picks up much better than before.
There's also one person who got JB3 (the full-on tuning version) as well but install is a bit harder and the price higher.
Ege