MagnaFlow OEM Grade universal catalytic converter (51959) for 2020-2023 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD trucks with the 6.6L V8. Built to OEM Grade standards with a 3in inlet and 3in outlet, a 9in overall length and a 5in round spun stainless body, it uses a ceramic substrate and 16-gauge 409 stainless steel tubing for corrosion resistance and long service life. Federal/EPA compliant for OBDII vehicles with Federal emissions systems; not legal for sale or installation in California, Colorado or New York. Universal design with pipe (weld-on) connections requires cutting and welding to install.
| Type | Universal catalytic converter (OEM Grade) |
| Compliance | Federal/EPA compliant (not CARB; not legal in CA, CO or NY) |
| Material | 16-gauge 409 stainless steel, ceramic substrate |
| Body | Round spun, 5in diameter |
| Inlet / Outlet | 3in / 3in, pipe (weld-on) connection |
| Overall Length | 9in |
| Sensor Ports | None (no O2 sensor bungs) |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020-2023 | Chevrolet | Silverado 2500 HD | Custom |
| 2020-2023 | Chevrolet | Silverado 2500 HD | High Country |
| 2020-2023 | Chevrolet | Silverado 2500 HD | LT |
| 2020-2023 | Chevrolet | Silverado 2500 HD | LTZ |
| 2020-2023 | Chevrolet | Silverado 2500 HD | WT |
| 2020-2023 | Chevrolet | Silverado 3500 HD | High Country |
| 2020-2023 | Chevrolet | Silverado 3500 HD | LT |
| 2020-2023 | Chevrolet | Silverado 3500 HD | LTZ |
| 2020-2023 | Chevrolet | Silverado 3500 HD | WT |
| 2020-2023 | GMC | Sierra 2500 HD | AT4 |
| 2020-2021 | GMC | Sierra 2500 HD | Base |
| 2020-2023 | GMC | Sierra 2500 HD | Denali |
| 2022-2023 | GMC | Sierra 2500 HD | Pro |
| 2020-2023 | GMC | Sierra 2500 HD | SLE |
| 2020-2023 | GMC | Sierra 2500 HD | SLT |
| 2020-2023 | GMC | Sierra 3500 HD | AT4 |
| 2020-2021 | GMC | Sierra 3500 HD | Base |
| 2020-2023 | GMC | Sierra 3500 HD | Denali |
| 2022-2023 | GMC | Sierra 3500 HD | Pro |
| 2020-2023 | GMC | Sierra 3500 HD | SLE |
| 2020-2023 | GMC | Sierra 3500 HD | SLT |
