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the diesel particulate filter (dpf) traps the soot and when it gets restricted it goes into what is called a regeneration cycle which heats the exhaust in order to clean it out. threr are delete kits available but your dealer will probably void your warranty if the emissions are tampered with
 

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Yup, and somehow er another, the EGR assists the DPF with regeneration. So if you take one off, yer gonna have to take 'em both off. Many guys did one, or the other and had some pretty bad problemos.

I took the muffler off in an attempt to help get the EGT's down a bit, but it didn't seem to work very well. The ol' muffler is just on there for show on these trucks, IMO. Hell, it isn't even that much louder! :thud:
 

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You can do just a DPF delete and be fine but the EGR system is the real culprit of the system.
 
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