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Muffler delete


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The big muffler box is the SCR box, it’s where it the DEF fluid and exhaust and mixed and lowers the NOX levels. The outlet NOX sensor sniffs the exhaust as it comes out of the SCR box , if the NOX is to high you get the 5MPH derate . So in other words, it has to on there unless you get a delete done. 

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don't touch it like mack pro said it houses all those components it's where the magic happens we have a truck shop where I work and we have trucks lined up outside getting there dpf deletes reversed. got caught by the epa and now they have to put everything back on 

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