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I installed the racechip GTS black on my 2021 and have it dialed up to 7. I feel absolutely no power difference. I was also told that the 2021 has changed their encryption technology and no one has cracked the code on them as of yet. I just came out of of 18’ e63s and that car felt much quicker. I wish I would have done my homework a little more thoroughly. With the change in to the dash with the omission of the traditional round gauges and the inability to tune, I would have kept the MB.
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