MagnaFlow HM-Grade Federal/EPA-compliant direct-fit catalytic converter (23781) for the 2001-2007 Chevrolet Silverado 2500 HD, GMC Sierra 2500 HD and related GM trucks. Spun-body mandrel-bent 409 stainless tubing with a single laser-fusion weld replicates the OE design for smooth flow and a leak-resistant seal; installs with no cutting or welding, and includes the gaskets needed for a proper seal. Federal/EPA compliant (not for CA). OBDII.
| Type | Direct-fit catalytic converter |
| Grade | HM Grade |
| Material | 409 stainless steel (spun body) |
| Hardware | Gaskets included |
| Emissions | Federal/EPA compliant (not for CA) |
Documents: Technical Bulletin (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2003-2004 | Chevrolet | Avalanche 2500 | Base |
| 2005 | Chevrolet | Avalanche 2500 | LS |
| 2005 | Chevrolet | Avalanche 2500 | LT |
| 2005 | Chevrolet | Silverado 1500 HD | Base |
| 2003,2005 | Chevrolet | Silverado 1500 HD | LS |
| 2003,2005-2006 | Chevrolet | Silverado 1500 HD | LT |
| 2007 | Chevrolet | Silverado 1500 HD Classic | LT |
| 2001-2005 | Chevrolet | Silverado 2500 HD | Base |
| 2001-2006 | Chevrolet | Silverado 2500 HD | LS |
| 2001-2007 | Chevrolet | Silverado 2500 HD | LT |
| 2007 | Chevrolet | Silverado 2500 HD | LTZ |
| 2003-2007 | 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 |
| 2004-2005 | Chevrolet | Silverado 3500 | Base |
| 2004-2006 | Chevrolet | Silverado 3500 | LS |
| 2004-2006 | Chevrolet | Silverado 3500 | LT |
| 2004,2006 | Chevrolet | Silverado 3500 | WT |
| 2007 | Chevrolet | Silverado 3500 Classic | LS |
| 2007 | Chevrolet | Silverado 3500 Classic | LT |
| 2007 | Chevrolet | Silverado 3500 Classic | WT |
| 2007 | Chevrolet | Silverado 3500 HD | LT |
| 2007 | Chevrolet | Silverado 3500 HD | LTZ |
| 2007 | Chevrolet | Silverado 3500 HD | WT |
| 2000-2001 | Chevrolet | Suburban 2500 | Base |
| 2000-2009 | Chevrolet | Suburban 2500 | LS |
| 2000-2009 | Chevrolet | Suburban 2500 | LT |
| 2007 | Chevrolet | Suburban 2500 | LTZ |
| 2001-2003,2005-2006 | GMC | Sierra 1500 HD | SLE |
| 2001-2003,2005-2006 | GMC | Sierra 1500 HD | SLT |
| 2007 | GMC | Sierra 1500 HD Classic | SLE |
| 2007 | GMC | Sierra 1500 HD Classic | SLT |
| 2002-2004 | GMC | Sierra 2500 | Base |
| 2001-2002 | GMC | Sierra 2500 | SL |
| 2001-2004 | GMC | Sierra 2500 | SLE |
| 2003-2004 | GMC | Sierra 2500 | WT |
| 2002-2005 | GMC | Sierra 2500 HD | Base |
| 2001-2002,2006 | GMC | Sierra 2500 HD | SL |
| 2001-2007 | GMC | Sierra 2500 HD | SLE |
| 2001-2007 | GMC | Sierra 2500 HD | SLT |
| 2003-2007 | 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 |
| 2004-2005 | GMC | Sierra 3500 | Base |
| 2006 | GMC | Sierra 3500 | SL |
| 2004-2006 | GMC | Sierra 3500 | SLE |
| 2004-2006 | GMC | Sierra 3500 | SLT |
| 2004-2006 | GMC | Sierra 3500 | WT |
| 2007 | GMC | Sierra 3500 Classic | SL |
| 2007 | GMC | Sierra 3500 Classic | SLE |
| 2007 | GMC | Sierra 3500 Classic | SLT |
| 2007 | GMC | Sierra 3500 Classic | WT |
| 2007 | GMC | Sierra 3500 HD | SLE |
| 2007 | GMC | Sierra 3500 HD | SLT |
| 2007 | GMC | Sierra 3500 HD | WT |
| 2000-2009 | GMC | Yukon XL 2500 | SLE |
| 2000-2009 | GMC | Yukon XL 2500 | SLT |
