Why would "resonators" require heat shields? Why - if catalytic converters require heat to function properly - would Ford put them that far from the engine?
The two forward units are a three-way catalyst (TWC) which reduces NOx to N2 and O2, and converts HC and CO to H2O and CO2, and the two rearward units are an oxidation catalyst (OC) which, with the addition of secondary air from the Thermactor pump, convert HC and CO to H2O and CO2.
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