Well one of the main things is my tires are bigger than stock so it throws my speedometer off. With the tuner I corrected it and now I have an accurate speedometer again. Also I have gutted cats so my check engine light would always be on. Now I can clear it easily without having to go somewhere. It lets me monitor my trans fluid temp so it doesn't overheat does the same with cylinder head temp. I also have it reading my mpgs so I can look at that and adjust my driving accordingly. Its a pretty neat device
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Painting the grille makes a big difference. Looking good!
6" BDS Lift, Fox Shocks, 35" Nitto Trail Grapplers on 18" KMC XD Spys, Westin Bull Bar w/ Rigid 20" LED bar, Magnaflow 1-into-2 out the back, K&N Cold Air Intake, Rugged Cover tri-fold, SCT X3 with 5-Star Tunes.
Build thread: http://www.f150forum.com/f6/02-super-crew-build-108367/