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I have the MPPK on my X5. Mine is an Xdrive but I'm not sure if there is a difference for the Sdrive. I won't get into a debate of this vs. an ECU Tune or a Piggback system. For me I wanted something developed by BMW that would never void my warranty and would not change the drivability of the X5. Did it make a difference I could feel? Definitely! I do feel the extra power in Normal mode but in Sport it's much more noticeable. BMW is conservative in their rating of the additional horsepower gains. The price vs. the horsepower gains may/may not be worth it to you but for me I'm totally satisfied and would recommend it.
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