Degradation of gas emission rate throw away is influenced by channel form and streamdistribution in channel of catalytic converter. From recommended model in the research of firstyear, that is model 1 and model 4 showing result of good spreading. From result of data analysiswith recommended model in research of first year indicate that the degradation of biggest emissionon the 4 model, especially for the rate of emission of HC equal to 21,4% and rate of CO equal to24,6%, while for model 1 as a whole still under model 4.
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