Anybody know where I can purchase 2 catalytic converters for my 04 GX470

 

I think catalytic converters are covered under the EPA/Federally mandated 8yr/80K limit (for defects).

Maybe you have other extenuating circumstances (mileage or damage from off-road) but if they are just bad, you should be covered. Might check w/ dealer if you're w/in the limits.