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As a result, it was found that thinner wall thickness design had lower pressure loss before coating and that advantage was kept after coating until 60 g/l wash-coat amount. 6 mil wall thickness design had a potential of about 30% downsizing of the filter size compared to 13 mil one from the point of view of coated pressure loss. ...The PN filtration efficiency was influenced by the wall thickness and pore size distribution after catalyst coating. As a conclusion, it was confirmed that the thinner-wall high-porosity R-SiC GPF has a possibility of catalyst amount reduction, better packaging for TWC coated GPF system because of its downsizing potential due to lower pressure loss and smaller heat capacity.