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01-25-2007, 11:25 AM
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#7 |
 Drives: White 2007 2 Door hatch Yaris Join Date: Jan 2007
Location: Rowland Heights, CA
Posts: 22
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Yea, looking at the diagram it seems like the front two are pre-cats, I'm not quite sure what they do in the yaris but on the 86-91 Rx-7's (They also had a 3 stage cat system) they would act like combustion chambers to burn the excess hydrocarbons that were thrown out by the engine.
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