Catalytic Converter - 2002 Corvette C5 LS1

The 2002 Chevrolet Corvette C5 utilizes distinct close-coupled catalytic converter modules specific to the 2001-2004 facelift era. When sourcing from salvage yards, verify the donor vehicle is a base LS1 model (not the Z06) and confirm part numbers 12556111 (driver side) and 12556112 (passenger side) stamped on the heat shield tags. These units feature integrated AIR (Air Injection Reaction) tubes that commonly crack at the weld seams—inspect carefully for exhaust leaks at these nipples before purchase. The 2001-2004 design uses ball-socket connections requiring specific V-band clamps (GM 11517782), unlike the 3-bolt flanges of 1997-2000 C5s. Always replace the donut gaskets and check oxygen sensor boss threads for damage during installation. Rattling substrate indicates internal ceramic breakdown, a common failure mode from rich fuel conditions or misfires.