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Originally Posted by spgribben007
My question is it really true in their sales pitch that the secondary cats are not really necessary? What is their purpose to the car?
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2ndary cats are not necessary. I know the 2.5L's have only one set. I'm not certain but I also think that pre-03's may have just one set as well. Anyway, bypass pipes might not be a great idea as there is a sensor that plugs into the cat and it has nowhere to go if pipes are used. I believe this may confuse the ecu and trigger CEL's. High flow cats may be a better option.