MagnaFlow 5421012 Catalytic Converter - Rear

California OBDII Direct-Fit Converter

MagnaFlow 5421012 is a California Grade, CARB-compliant direct-fit catalytic converter for the rear position on select Subaru applications. It is built with stainless steel construction, mandrel-bent tubing, and a ceramic substrate to support proper exhaust flow and OE-style fitment.

Designed for the 2008-2014 Subaru Impreza and 2015-2016 Subaru WRX STI, MagnaFlow 5421012 is a bolt-on replacement that installs without cutting or welding when used with the proper tools. It also cross-references OE part 44611AA250 for the same application.

Key Features

• Direct-fit catalytic converter for the rear exhaust position
• CARB-compliant California Grade design for listed vehicles
• Stainless steel body and tubing for corrosion resistance
• Mandrel-bent tubing to reduce flow restriction
• Ceramic substrate construction
• Includes hangers and mounting hardware
• Uses a bolt-on inlet for straightforward installation
• Overall length: 34.75 inches

Fitment Details

• Fits 2016 Subaru WRX STI, rear
• Fits 2015 Subaru WRX STI, rear
• Fits 2014 Subaru Impreza, rear
• Fits 2013 Subaru Impreza, rear
• Fits 2012 Subaru Impreza, rear
• Fits 2011 Subaru Impreza, rear
• Fits 2010 Subaru Impreza, rear
• Fits 2009 Subaru Impreza, rear
• Fits 2008 Subaru Impreza, rear

What This Part Helps Address

• Check engine light concerns related to a failing rear catalytic converter
• Exhaust leaks caused by worn OE converter sealing surfaces
• Corrosion damage to the original converter housing
• Restricted exhaust flow from a deteriorated substrate
• Need for a CARB-compliant replacement on listed Subaru models

Installation Notes

This direct-fit converter is made for bolt-on installation with no cutting or welding required. Use the included gaskets to help achieve a proper seal and reduce the chance of exhaust leaks. Confirm rear-position fitment and vehicle emissions requirements before installation on your Subaru Impreza or Subaru WRX STI.

Quality Assurance

MagnaFlow uses 3D scanning and metrology-based design methods to match OE fit and function. This California Grade converter is tested to meet CARB guidelines for legal use in California and other CARB-restricted states on the listed vehicles.