On the seven, there are two sets. Two microfilters on the hood itself (back by the windshield washers) and two inside the cabin (one on either side of the dash, above the transmission tunnel). The two in the hood are the easiest to change, and also the most expensive. The two in the cabin are a bit more difficult (especially the driver's side) but are a lot cheaper (they can be washed, dried and reinstalled in their holders).
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