Pipercross Plus has improved strength and rigidity, swapping out the mesh used in the regular Pipercross panel filters and replacing it with a stronger and better looking 1mm steel frame. You can really feel the difference that this change makes to the strength of the filter, even when pulling 100’s of CFM (cubic feet per minute) through the foam. A special and new foam matrix has been used after testing multiple formulations of foam with varying results to ensure the ultimate combination. Performance is always the end goal, but Pipercross didn’t want to lose the high filtration quality already found in their filters.