Changing Mufflers on a cat c7
I have learned from experience with my Dodge truck (1998 cummins 5.9 isb) that when I added a 4 inch exhaust and a low restriction muffler that my exhaust temperature dropped some. I have a 2004 cat c...
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With stock fueling there's probably nothing to be gained with a different muffler. Your EGT's wont get too high so there's no need to lower them.
