"...Came with a DPF." Sounds like you've already done the deed (DPF delete). My buddy at work did a DPF delete on his Dodge and improved fuel ecomony by 33%, no lie. I really uncorks the 6.7s. Plus, it makes the VGT sound like a jet taking off! While doing that I would do the EGR delete as well to get a bit more. You wouldn't believe how much fuel those things dump into the exhaust to keep your DPF happy.
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