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From what I read, it does assist in catalyzing pollutants while the primary heats up. Once the primary is fully functional, the secondary has little to do with pollutants since the primary already had it's pass at the gas (pass gas lol).
My thought is that the secondary is still a catalytic converter, as long as it is converting/catalyzing within the acceptable threshold, it should be fine--aside from cold start emissions. I will continue to look for more info on this.
If you can point me to some reading on this I'd appreciate it. I read your first line on a BMW board.
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