I am OK with mine in terms of performance. I am really disappointed about Burger Tuning and any improvement to the JB4. I don't think we will get to see the steering wheel interface because Burger says they have not sold enough 535 tunes. Also, on later model 535's, there is no way I have found to get the USB cable into the interior. It would be great to be able to run the log while actually driving the car somewhere.....
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