I used their video for mine as well, only difference I noticed was the tweeter speaker grill on the driver's door didn't need to be removed on my 2011. I think the passenger was just like their videos but can't remember for sure.
I attached a pic of the speakers I used for anybody else looking to upgrade. I included front and rear shots for comparison of cone material and magnets as well as how I modified the tweeter mounts to work in the X3. The BMW Individual Audio speakers on on the right in all the pics.
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