The upper filter housing of some 4WDs features a seal surface too narrow to match the seal of the filter itself. As a result, the filter is not able to be fully effective, allowing dust to pass through the airbox and enter the engine intake, causing havoc with components.

In response, Terrain Tamer designed a range of vehicle specific, stainless-steel filter inserts for the most problematic vehicle models, which, when fitted, create a surface area that perfectly matches the filter, aligning in the correct position to properly seal, and reducing the issue of dusting.