MagnaFlow 452843 Catalytic Converter with Integrated Exhaust Manifold - Front

California-Compliant Direct-Fit Replacement

MagnaFlow 452843 is a direct-fit catalytic converter with integrated exhaust manifold for select Lexus applications. It is built for the 2000-2005 Lexus GS300 and 2001-2005 Lexus IS300 front positions, with CARB-compliant certification for listed California and CARB-restricted state vehicles.

Designed for a factory-style replacement, this MagnaFlow California Converters part uses stainless steel construction, mandrel-bent tubing, and a spun-body design to match OE fit and function. The integrated manifold layout helps simplify replacement on the Lexus GS300 and Lexus IS300 while supporting proper exhaust sealing and emissions performance.

Key Features

• Direct-fit catalytic converter with integrated exhaust manifold
• CARB-compliant California Grade design for listed vehicles
• Stainless steel converter body and tubing for corrosion resistance
• Spun-body construction with a single laser fusion weld to reduce leak points
• Mandrel-bent tubing for freer exhaust flow
• Pre and post converter oxygen sensor locations
• Bolt-on inlet type with included gaskets for sealing
• Interchanges with OE part numbers 17140-46030 and 17140-46080

Product Details

MagnaFlow’s California Converters line focuses on emissions-compliant replacement parts for vehicles that require CARB certification. Part number 452843 is engineered using 3D scanning and OE-style geometry so the replacement matches the original exhaust manifold and catalytic converter layout on the Lexus GS300 and Lexus IS300. The ceramic substrate, stainless steel construction, and compact low-mass design support thermal efficiency and durable service in demanding exhaust environments.

This part cross-references OE numbers 17140-46030 and 17140-46080 for the same application.

Common Issues This Part Addresses

• Check engine light related to catalytic converter efficiency
• Exhaust leaks at the manifold or converter connection
• Failed emissions inspection on listed California-compliant vehicles
• Corrosion damage to the original exhaust manifold converter assembly
• Fitment problems caused by non-OE-style replacement parts

Installation Notes

Fits 2000-2005 Lexus GS300, front. Fits 2001-2005 Lexus IS300, front. Use the proper tools for installation; no cutting or welding is required for the direct-fit design. Verify oxygen sensor routing, align the bolt-on inlet correctly, and install the included gaskets to help achieve a proper seal.

Quality Assurance

MagnaFlow uses 3D scanning during development to verify fit and function against original equipment. This California Grade converter is certified by CARB for legal use on the listed Lexus GS300 and Lexus IS300 applications in California and other CARB-restricted states.