as a diesel mechanic of many years,,and believe me,i love to hop up stuff,id truly recommend leaving your 6.7 alone,,these newer diesels are highly sophisticated and youll loose your warranty with mods.6.7 are capable of more power,but I don't think youll improve your mpg enough to even pay for the upgrades.
I agree with this.
I did my upgrades because the reliability of my "brand new" Cummins was horrible.
I had to either sell the truck, fix the emissions, or remove the emissions from it. I literally had to choose.
I was upside down on a trade and I didn't want to fix the emissions every 75k miles so I gave the truck a hysterectomy.
The only thing I regret is not doing it sooner (like at 10K miles).
If I keep the truck for 300K miles I figure I paid for the $3300 worth of "upgrades" to it.
I rolled the dice and so far 30K miles later I'm still running it with no issues and a MPH improved of 2-3MPG. Ton more power for everyday driving though. I'm not one of these knuckleheads that drives around blowing black smoke in peoples windows either....
my egr was 90% clogged
My dpf was fully cllogged and putting the truck into limp mode
my def sensors were constantly messing up
Now I have no issues and I dont have to put DEF fluid in the truck and I dont break down on the side of the road.
We can thank our EPA for making the vehicles less than reliable and getting bad fuel mileage.
If someone wants to compare the emissions released into the air from a straight run truck VS the emissions put into the air to make the parts that are now on every truck I would be glad to see those statistics.... Its a money scam and a huge joke.
