Well....
I have had a RaceChip (set on C) for about 7 months of the first year with my 2015 X5 x35i xLine. I have enjoyed it. I had the MPPK installed the other day and wow what a great upgrade to the car. I drove it for a couple of days without the RC. Yesterday I stacked the RC on top of the MPPK and all I can say is do it. Each and every one of you......
Just do it.
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