An engine, comprising: a breather conduit; an intake conduit; an air filter assembly comprising: a case comprising a first opening for receiving the breather conduit, and a second opening for receiving the intake conduit, and a filter element comprising a first wall including a first aperture and a second aperture, a second wall, and filter media (166 extending between the first and second walls (164, 162) and at least partially defining an interior chamber of the filter element; wherein the first and second apertures (172, 170) of the filter element are at least partially aligned with the first and second openings (180, 182) of the case, respectively; wherein the filter element is positioned in the case such that the breather conduit is connected to the interior chamber of the filter element via the first opening and the first aperture and the intake conduit is connected to the interior chamber of the filter element via the second opening and the second aperture, whereby air filtered by the filter media mixes with unfiltered gases from the breather conduit in the interior chamber of the filter element prior to entering the intake conduit. a breather conduit; an intake conduit; an air filter assembly comprising: a case comprising a first opening for receiving the breather conduit, and a second opening for receiving the intake conduit, and a filter element comprising a first wall including a first aperture and a second aperture, a second wall, and filter media (166 extending between the first and second walls (164, 162) and at least partially defining an interior chamber of the filter element; wherein the first and second apertures (172, 170) of the filter element are at least partially aligned with the first and second openings (180, 182) of the case, respectively; wherein the filter element is positioned in the case such that the breather conduit is connected to the interior chamber of the filter element via the first opening and the first aperture and the intake conduit is connected to the interior chamber of the filter element via the second opening and the second aperture, whereby air filtered by the filter media mixes with unfiltered gases from the breather conduit in the interior chamber of the filter element prior to entering the intake conduit. a case comprising a first opening for receiving the breather conduit, and a second opening for receiving the intake conduit, and a filter element comprising a first wall including a first aperture and a second aperture, a second wall, and filter media (166 extending between the first and second walls (164, 162) and at least partially defining an interior chamber of the filter element; wherein the first and second apertures (172, 170) of the filter element are at least partially aligned with the first and second openings (180, 182) of the case, respectively; wherein the filter element is positioned in the case such that the breather conduit is connected to the interior chamber of the filter element via the first opening and the first aperture and the intake conduit is connected to the interior chamber of the filter element via the second opening and the second aperture, whereby air filtered by the filter media mixes with unfiltered gases from the breather conduit in the interior chamber of the filter element prior to entering the intake conduit.