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I did the Turner Motorsports Tune, it cost about $800 and I installed it myself in about two hours. I am happy with it so far, but with all of these tunes you do not get the extra HP until you get above around 6200 RPM. So I rarely ever use it since I mostly drive in city traffic.
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2014 X6M (daily)
2015 S63 AMG (beach car)
2017 Alpina B7 (Wife)
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