This 3.5L Catalytic Converter from YITAMOTOR is compatible with the 2006-2011 Chevy Impala/2006-2007 Monte Carlo.certifications:OBD-II , Federal EPA , Non-CARB, material:Stainless steel, restricted states:California, New York, Colorado , Maine, fitment type:Direct replacement, dimensions:33.5 in. overall length, connection type:2 bolt welded flange, inlet type:Singel (2-bolt welded flange), outlet type:Singel (2-bolt welded flange), oxygen sensor location:Post-catalyst, substrate:Ceramic, interchange part number:18366, 642235, other part number:54693, 54019, warranty:5 years or 50,000 miles limited