There are two, located in each of the top corners under the bonnet. Unscrew the retaining bolt (13mm) and unclip the holders to remove. Will take less than a minute each.
http://brokenappliance.blogspot.com/2008/06/replacing-bmw-e60-microfilter-cabin-air.html
in the trunk
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Yes it is possible
Check glove box there are fuses there
open the hood and look at the top of the engine compartment near the windshield. there is one rectangular container on each side that has a long black lever retainer spring and a screw lock. you need to replace both if they are dirty. simple to do in five minutes.
125
There isn't one in this model I have the same car. Contact your BMW service center
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