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I love the JB4 in my Golf R. Maybe it is junk. It sure has transformed the car for the better, it can be unplugged at any time and no one will ever know it’s there. So my junk has value to me. I got lucky that the Cobb tune in my Macan GTS didn’t cause me warranty issues. I think the dealer did me a favor the two times it was in for engine work. I would have loved the unplug it and it’s gone forever functionality with that car. Others, of course, are entitled to their different opinions.
I will definitely keep a JB4 in mind once I have broken in my M2. If it ever leaves the NJ port, that is. I for one will never install a true tune on a car still within the warranty period unless it is something like Dinan done by the dealer that will fix my car. Had a Dinan tune on my X5 a while back and it made a big difference to that car.
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