A Volant Primo Filters are designed to work with diesel engines such as Chevy/GMC Duramax, Dodge Cummins, and Ford PowerStroke. Volant made this filter with new Red line diesel air filters to help customers identify the Primo Filter from Pro-5 filter which has a standard blue line air filter. Considering diesel engines’ exposure from extreme situation and environment, Volant have designed this filter capable of providing a better air flow and efficient in spite of any condition. In fact, aside from being confirmed to be one of the best air filters on the market today, this Volant Diesel Filters was examined and tested by an ISO certified facility.