These Rear Catalytic Converters with 2.5L w/Gasket Bolts from YITAMOTOR are compatible with the 02-06 Nissan Altima.certifications:OBD I , OBD-II , Federal EPA , Non-CARB, material:Stainless steel, restricted states:California, New York, Colorado , Maine, fitment type:Direct replacement, connection type:2 bolt, oxygen sensor location:Pre Catalyst, oxygen sensor ports: 1, substrate:Ceramic, placement on vehicle:Rear, interchange part number:0991401, 324202, 642280, other part number:54360, 40514, 88140, 58140, manufacturer part number:Y01O09043, warranty:5 years or 50,000 miles limited