For 1990-2009 cars

Application | GM SPO Group Number
--- | ---
Catalytic Converter Heat Shield | 03.690
Exhaust Heat Shield | 03.705
Exhaust Muffler | 03.701
Exhaust Muffler Heat Shield | 03.705
Exhaust Pipe | 03.609
Exhaust Pipe Heat Shield | 03.616
Exhaust Tail Pipe Extension | 03.705
Heated Oxygen Sensor | 03.682
Oxidation Catalytic Converter | 03.682
Three Way Catalytic Converter (With Exhaust Manifold Pipe) | 03.685