MagnaFlow CARB-grade California-compliant direct-fit catalytic converter (4551479) for the 2003-2006 Chevrolet Silverado 2500 HD and GMC Sierra 2500 HD 6.0L (plus additional 3500 and Classic models listed below). The spun-body 409 stainless construction with a single laser-fusion weld replicates the OE design for smooth flow and a leak-resistant seal and installs with no cutting or welding. Includes gaskets. CARB EO compliant for legal use in California and CARB states.
| Type | Direct-fit catalytic converter |
| Grade | CARB Grade (California) |
| Material | 409 stainless steel (spun body) |
| Hardware | Includes gaskets |
| Emissions | CARB EO compliant (CA legal) |
Documents: Technical Bulletin (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2003 | Chevrolet | Silverado 2500 HD | Base |
| 2003,2006 | Chevrolet | Silverado 2500 HD | LS |
| 2003,2006 | Chevrolet | Silverado 2500 HD | LT |
| 2003,2006 | Chevrolet | Silverado 2500 HD | WT |
| 2007 | Chevrolet | Silverado 2500 HD Classic | LS |
| 2007 | Chevrolet | Silverado 2500 HD Classic | LT |
| 2007 | Chevrolet | Silverado 2500 HD Classic | WT |
| 2003 | GMC | Sierra 2500 HD | Base |
| 2006 | GMC | Sierra 2500 HD | SL |
| 2003,2006 | GMC | Sierra 2500 HD | SLE |
| 2003,2006 | GMC | Sierra 2500 HD | SLT |
| 2003,2006 | GMC | Sierra 2500 HD | WT |
| 2007 | GMC | Sierra 2500 HD Classic | SL |
| 2007 | GMC | Sierra 2500 HD Classic | SLE |
| 2007 | GMC | Sierra 2500 HD Classic | SLT |
| 2007 | GMC | Sierra 2500 HD Classic | WT |
