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SiC is well known as a ceramic with high mechanical strength and thermal conductivity, and the R-SiC-DPF (recrystallized SiC-DPF) used these excellent properties is widely recognized as the substrate material for DPF. DPF system requires the material possessing high thermal shock resistance against an unexpected accident, such as an uncontrolled regeneration. One of the indices indicating the thermal shock resistance of the DPF is soot mass limit, which is an important factor determining the penalty of vehicle fuel consumption. In order to further increase the soot mass limits of R-SiC-DPF, this paper covers the attempts of IBIDEN to promote the sintering of the neck part of a SiC porous body using a sintering additive. Al2O3, well known as a sintering additive for a SiC dense body, was selected as the sintering additive.