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I have the mmr and it looks like, atleast to me, that they use a k&n filter. It uses the same maf as the stock intake, you jus unplug it from the original and plug into the new one.
One guy here has one I think but he lives near them and was prototype or something like that, I may be wrong, but they developing, great gain I read...
It's been my experience that wet type filters such as the k&N offer great filtration but over time can coat the maf sensor with oil distorting the readings. I prefer to use dry type filters like Vibrant.