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ive got a 2013 lml duramax. im wanting to put a 4" exhaust on it because my dpf needs replaced but i can not find out how to adjust dpf and egr settings. i had mpvi4. ive looked through multiple forums and found no help. this truck is not a daily driver nor is it on road use. it is strickly a fire wood / chore truck. any help would be extreamly appriciated.
