MagnaFlow 447270 Catalytic Converter - Left

California OBDII Direct-Fit Converter

MagnaFlow 447270 is a California Grade, CARB-compliant direct-fit catalytic converter built for specific GM truck and SUV applications. It is engineered for a bolt-on replacement on the left side, with stainless steel construction, a ceramic substrate, and OE-style fitment for service on emissions-related exhaust repairs.

Designed for the 2001 Chevrolet Silverado 2500, 2001 GMC Sierra 2500, 2002-2006 GMC Sierra 2500 HD, 2005 GMC Sierra 1500 HD, 2005 Chevrolet Silverado 1500 HD, 2005 GMC Yukon XL 2500, 2006 GMC Sierra 1500 HD, 2006 GMC Sierra 2500 HD, 2002-2005 GMC Yukon XL 2500, and 2003 GMC Sierra 2500 HD applications, MagnaFlow 447270 is a direct-fit solution for California and CARB-restricted states where listed.

• Direct-fit design for specific left-side applications
• Stainless steel body and tubing for corrosion resistance
• Ceramic substrate for emissions control
• OE-style spun body design with laser fusion weld
• Post-converter oxygen sensor location
• Heat shield attached for added thermal management
• Clamp, hangers, and gaskets/hardware referenced for installation support

MagnaFlow Direct-Fit California OBDII Converters

The MagnaFlow Direct-Fit CALIFORNIA OBDII CONVERTERS line is built around OE-style replacement fitment and CARB compliance for regulated applications. Part number 447270 follows that approach with a compact, low-mass design, mandrel-bent tubing, and 3D-scanned development data to match original equipment geometry as closely as possible. This helps maintain proper exhaust routing and emissions-system function on the listed Chevrolet Silverado 2500 and GMC Sierra 2500 HD platforms, along with other confirmed GM fitments.

What It Helps Address

• Check engine light concerns related to catalyst efficiency codes
• Failed emissions inspection on CARB-regulated vehicles
• Corroded or damaged factory catalytic converter assemblies
• Exhaust leaks at the converter body or sealing points
• Fitment issues from non-direct replacement parts

Installation Notes

Fits 2001 Chevrolet Silverado 2500, left; Fits 2001 GMC Sierra 2500, left; Fits 2002-2006 GMC Sierra 2500 HD, left; Fits 2005 Chevrolet Silverado 1500 HD, left; Fits 2005 GMC Sierra 1500 HD, left; Fits 2005 GMC Sierra 2500 HD, left; Fits 2005 GMC Yukon XL 2500, left; Fits 2006 GMC Sierra 1500 HD, left; Fits 2006 GMC Sierra 2500 HD, left; Fits 2002-2005 GMC Yukon XL 2500, left; Fits 2003 GMC Sierra 2500 HD, left.

Use the proper tools and verify the vehicle’s emissions certification, engine family, and left-side application before installation. This direct-fit converter is designed to install without cutting or welding on the listed vehicles. This part cross-references OE-style replacement applications for the same vehicle fitment.

Quality Assurance

MagnaFlow uses 3D scanning during development to verify fit and function against original equipment geometry. Part number 447270 is built to meet or exceed California Air Resources Board requirements and has undergone additional testing for CARB compliance on the listed applications.