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Questions about MPPK.
35i owners who have it:
1- is this a package that still gets installed after the vehicle arrives at the dealership or is it added in the factory when vehicle is being assembled?
2- does it increase the fuel efficiency or decrease it?
3- how different does the car become?
4- what does this kit exactly add to the car?
5- who should get it and who shouldn't?
6- is it worth the upgrade?
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