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If the system is complete and in working order, the air pump driven off the engine accessory belt, pumps fresh air into those tubes you question. The fresh air pumped in helps the catalytic converters clean up emissions. You can plug them off if you want to but you may not pass an emission test.

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Q: What do the heat tubes do that come off the catalytic converters on a 1996 Dodge 3500 with the 360 gas motor Can i just plug them off?
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