Should be about 4 bolts around the edges. They are studs attached to the firewall and nuts on the box side. Then you need to unclip all the little clips around the airbox to get the airbox apart. The core is in the middle. Undo the lines going to the core before removing the airbox. They may even be blocking the lower two bolts from view. Disconnect and of course mark all vacuum lines to the box as well.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....