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Old 01-26-2007, 11:38 AM   #11
largeorangefont
Break'em off some.
 
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Drives: 07 Yaris LB, 04 Cobra
Join Date: Jan 2007
Location: So Cal, OC
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Quote:
Originally Posted by jouslee View Post
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.
The precats are for when the engine is cold.
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