Check out this link:<br><A HREF="http://forums.swedespeed.com/zerothread?id=49046&page=1" TARGET="_blank">http://forums.swedespeed.com/z...age=1</A><p>The first post contains an image of an S40 engine with the k&n air intake kit installed. Just to the left of the k&n filter is where the S40's stock air box would be locate. Your air filter is locate in that box.<p>
As they said the airbox is in the front left of the engine compartment and is secured by two screws. Loosen the screws and pull straight up and the airbox compartment pulls out with the filter. Don't let the loose junk in there get into the intake.