If i had to do it again i would do all the same things. I got everything form MKM Customs.
-4" MBRP fit up amazingly well. Make sure to tighten the bolts with an impact gun. Then retighten in 1000 miles or so. Not too loud. Actually my fiance did not even notice it with the windows up. When you stomp on the gas at 50mph and break the 4 rear wheels loose she seamed to notice :coffeedrink:. The truck really moves! I love the sound.
- SCT all the way. Talk to Mike P at MKM Customs very nice guy and they helped me trouble shoot and FICM issue that came up.
I get about 19.5 mpg at 65 mph in a long bed crew cab FX4 Dually!!! on the Performance tune 420 whp and 830 ftlbs. I just got my economy tune and i will be testing it in a couple weeks. Lookin to hit 22 mpg at 65 mph :victory: I don't know why people drive toyotas LOL. (i really do, but this mpg is just crazy). The tuner said that i should be mid 13's in the quarter mile. No i don't race, but just a referance point.
- Make sure to do a FICM 58v Swamps upgrade, EGR Sinister Delete, and new injector pump spring

- Always run gauges...
- might want to think about some extra filtration ie bypass oil and coolant filters

- Regardless get that POS Ford Gold Coolant out of it!!! before you blow up an EGR. Previous owner blew up 2 in the first 72k miles :Wow1:
Just my thoughts