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Anyone know why the 6.4s have such a crazy looking exhaust tips? The vents in the tip must serve a purpose but I have no idea what it could be other than to mixed extra air into the gases as they leave to further dilute any soot comming out. Anyone know the true reason?
 

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From what i know, its to try to keep the temps down when the truck goes into regen. The exhaust get pretty hot when the truck regens!!
 

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Actually your both right. they are there for heat displacement and because the o2 reader dont read in the exhaust they read just outside them, therefore showing less carbon
 
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