MagnaFlow 337304 Catalytic Converter

California-grade universal catalytic converter

MagnaFlow 337304 is a California Grade CARB-compliant universal catalytic converter built for pre-OBDII applications that require a 2-inch weld-on exhaust solution. Its stainless steel spun-body construction, ceramic substrate, and compact low-mass design support corrosion resistance and thermal efficiency for listed vehicles such as the Toyota Supra, Mazda RX-7, and Ford Mustang.

Key features

• CARB Executive Order D-193-102 for listed California and CARB-restricted applications
• Universal fit design for cut-and-weld installation
• 2-inch inlet and 2-inch outlet with straight weld-on connections
• Stainless steel body and tube construction for corrosion resistance
• Round spun body with a ceramic substrate
• Low-mass design for improved heat-up characteristics
• Single laser fusion weld to help reduce leak potential
• No oxygen sensor ports, heat shield, hangers, or mounting hardware

Product details

This MagnaFlow 2in. Universal California Pre-OBDII Catalytic Converter is designed for direct exhaust fabrication where a universal converter is needed to service specific pre-OBDII vehicles. Part number 337304 is listed for a wide range of applications, including 1990-1995 INFINITI Q45, 1993-1995 Geo Prizm, 1987-1995 Toyota Supra, and 1983-1986 Ford Mustang front applications. The spun stainless body and ceramic substrate are engineered to meet or exceed California Air Resources Board requirements for the listed vehicles, making this a practical choice for emissions-focused exhaust repair on older platforms.

This part cross-references Walker 15038 and Eastern Catalytic 70304 for the same application.

What it helps solve

• Check engine light concerns related to a failed catalytic converter on pre-OBDII vehicles
• Emissions test failures on listed California and CARB-restricted applications
• Restricted exhaust flow caused by a deteriorated or clogged converter
• Corrosion-related converter housing damage in older exhaust systems
• Fabrication needs when replacing a converter in a weld-in exhaust layout

Installation notes and tips

Installation requires cutting and welding. This universal converter uses weld-on inlet and outlet connections, so proper exhaust measurement, alignment, and fabrication are important before final welding. Verify the vehicle’s listed fitment, position, and CARB Executive Order coverage before installation. Because there are no sensor ports, this unit is intended for applications that do not require oxygen sensor placement in the converter body.

Quality assurance

MagnaFlow 337304 is built to meet or exceed California Air Resources Board requirements and has undergone additional testing for CARB guideline compliance on the listed vehicles. The stainless steel construction, spun-body design, and laser fusion weld are used to support durability and leak resistance in emissions-critical exhaust service.