So I finally got around to messing with the dually a little bit today with the help of SPE and The good fella's at diesel power products who were nice enough to track down a couple random things and overnight them to me.
1st off I took off every shield and plate under the truck including pretty much everything you pay for in the FX4 package
2nd the steps , I really thought I was going to leave them on this time but oh well they came off.
3rd Flow-Pro test pipe , literally just bolts up to the existing tail pipe section which is exactly what I was going for because I really like the factory chrome tips of the Lariat with the chrome package.
4th The DEF tank ........
Honestly I thought the straight pipe with the factory tail pipe with the tiny tiny muffler in the axle over section was going to be very loud but it is extremely conservative and gives a very subtle rumble at idle for only spending 250 on an exhaust it is absolutely exceptional .
Now as for the tune .......
I spoke with Dan today because I want a tranny tune that doesn't suck , he already has my engine file down to a science and its always been me favorite engine file , fastest NO gearhead was wayyyyy faster but favorite all around hell yea . What he did with my tranny file was nothing short of magic he told me he has been working on a Heavy Tow HD trans file and a few people have tried it an loved it. It is the perfect blend of rocket ship and tug boat which I think literally eliminates the need for TOW/HAUL. It has 3rd gear lock up and hold all the gears REAAAALLLLLLYYYY long I mean 1850-2100. No more 3rd gear in parking lots no more cruising at 45 in 6th gear at 900 RPM. It is an absolute beast and if you fall below 1400 or so while cruising it kicks down and gets you rite back in the powerband. It is fantastic.