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When I first bought my 2013 X6M, I was very disappointing, after having for 3 years x6 5.0i (Factory tuned up). Car didn't feel same responsive, and I was yelling at myself, until now, when I got myself a stage 1 tune, with completely re writing my ECU. Now, it is a scary mAAAAnster. Its undescribable, unexplainable.....you just have to have it to understand.
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