The MagnaFlow Stainless Steel Catalytic Converter that will work on the 2003 Mitsubishi Eclipse with 3.0 Liter V6 is the MagnaFlow Stainless Steel Catalytic Converter - Universal - California Approved, item # MF41005. This is the rear catalytic converter only.
The 2003 Mitsubishi Eclipse with 3.0 Liter V6 also has a front pre-converter and a rear pre-converter. The replacements for those parts are the MagnaFlow Stainless Steel Direct-Fit Catalytic Converter, front pre-converter, item #... view full answer...