Umm, why so fixated on the dyno? That can be faked just as easily as saying 90hp gain or 60hp gain. Also, every engine is slightly different, so what would give a 90hp gain on one may result only in an 85hp gain on another. Buy the tune, if you don't like it, return it. It should be about what makes you happy, not what the dyno says.

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Chris

2012 BMW X5 50i
2003 BMW K1200RS