With an emerging need for gasoline particulate filters (GPFs) to lower particle emissions, studies are being conducted to optimize GPF designs in order to balance filtration efficiency, backpressure penalty, filter size, cost and other factors. Metallic filters with a fibrous structure could offer additional designs to the current GPF portfolio, which is currently dominated by ceramic wall-flow filters. However, knowledge on their performance as GPFs is still limited. In this study, modeling on backpressure and filtration efficiency of fibrous media was carried out to determine the design criteria (filtration area, filter thickness and size) for different target efficiencies and backpressures at given gas flow conditions. Filter media with different fiber sizes (8 - 17 μm) and porosities (80% and 90%) were evaluated using modeling to determine the influence of fiber size and porosity. A comparison of fibrous filters with their ceramic counterparts is also discussed.