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We ordered a complete K&N air filter kit, which consisted of a filter, lid, and base. The white fiberglass adapter has a large hole in the center that completely covers the throttle body. The base plate for the K&N filter sits on top of the throttle body and bolts to the air box adapter, effectively making the whole adapter the base plate of the filter assembly. Mark four holes in the K&N base plate to be drilled for the attaching bolts.