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The MagnaFlow 24321 is a direct-fit catalytic converter for the 4.3L V8 Lexus GS430 (2001-2007) and SC430 (2002-2010). It bolts on in place of the factory unit with no cutting or welding, using mandrel-bent stainless steel tubing and a single laser-fusion weld for a leak-resistant, low-mass body. It is EPA federal-compliant, not California CARB-approved, so it suits owners in federal-emissions states who want OE-style fit without dealer parts. Against universal-fit converters, the direct-fit design saves fabrication time; against OE replacements, it is the common aftermarket alternative, though some owners report shorter service life than the factory part.
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Owners of GS430 and SC430 models generally report a clean bolt-on fit and a check engine light that stays off after install. Complaints center on durability, with a few reporting early failures or fitment trouble on modified exhausts.
This is a direct-fit catalytic converter for the 2001-2007 Lexus GS430 4.3L and the 2002-2010 Lexus SC430 4.3L. It is HM Grade and meets or exceeds Federal emissions requirements set by the EPA. It complies with legal standards for OBDII Federally registered vehicles with Federal/EPA emission systems.
The converter is built from stainless steel that resists corrosion and uses free-flowing mandrel-bent tubing. It replicates the OE design, and a single laser fusion weld reduces the possibility of a leak. The compact, low-mass design allows for greater thermal efficiency. The design was developed with 3D scanning systems so that it fits and functions like the original equipment.
It installs with the proper tools, and no cutting or welding is required. Two flat ring gaskets are included.
