Yeah off the top of my head the "regular" X1 and I would assume X2 does not have the notch vs the X2 M35i does. It's really weird how they bothered to make those small differences. I just changed both air filters for our X1 and X2 m35i maybe a month or two ago.. and they are different as with the MAF slot size as I mentioned years ago when I was messing around with making my own intake.
The only other little thing to know was that the oil filters were different which is VERY close, but.. not good enough.
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