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This is a stainless steel 300 or 400 (can't remember) cell count RT cat, It has a JDM 2.5" flange on the inlet and 2.5" three bolt on the out. There is a o2 sensor bung welded on. The length fit my 98 spec ITR header and USDM catback perfect. I can measure if you need. Has about 10,000 miles on it and the honeycomb looks like new.