This internal air filter from Mann-Filter captures airborne particulate before it enters the engine intake system. It is installed in the air cleaner housing on the engine, positioned downstream of the primary pre-cleaner stage. The filter element traps fine dust and debris that bypass the pre-cleaner, protecting the turbocharger, intake valves, and cylinder bores from abrasive wear. A restricted element causes a drop in intake manifold pressure, which reduces combustion efficiency and increases fuel consumption. The filter is constructed to the manufacturer's original pleat geometry and seal profile, which ensures proper seating in the housing and prevents unfiltered air from bypassing the media. On replacement, inspect the housing seal and clean the interior of the housing before installing the new element.