Ummm, if you're talking about adding an adapter for a filter like you have to do with an 850, not to worry, our S and V70's already have one. In fact, he would just be replacing his filter that's already in there. Also, rather than the dealer, I would buy the charcoal activated one from www.fcpgroton.com probably for about the same price as the one that's not (what the dealer offers). I would agree with you however, about cleaning the area out.

After the filter comes out, if may be worth looking down the fan shaft with a flashlight and if there is lent, etc. in there, using a vacuum cleaner and vacuuming out....some lysol spray in there isn't a bad idea either if you're having any odor at all in the cabin from the outside air.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.