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N55 is trickier. With the Procede we find that most cars have no issue. Cars that have an issue are normally early ECU firmware. Issue we have is nothing like reported above. It sounds to me like the issue reported above is a faulty JB or harness (that traction control going off sounds dangerous and is why we do not play with DTC on Procede). The only issue we really have with Procede is occasional code and limp at high RPM/boost/gear. I have had some customers that did not plug a connector on initially properly, but once fixed, no further issue. A while back we used to get an occasional code at cruise but that is fixed. I am not aware of any N55 procedes on latest firmware having any issue.... but for sure the N55 is not as stable is N54 when it comes to tunes. The DCT boxes are also a pain to use on the dyno and dyno results can be inconsistent on any N55, but they behave much better on the road.
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