If you start thinking about the tuners just buy the Smarty Jr. and be done with it.
Lots of recommendations for the Smarty's everywhere, but these days it's EFI that's quickly becomming the standard.
You can buy an EFI V2 and tune yourself, or go with one of the many different branded auto cal units.
cumminstuner
efi by ryan
starlite diesel
are a few of the recommended guys selling their brand/tunes on autocals
Skys the limit on what a guy can do, but even on stock trucks and just keeping a mild tune there's lots of nice options to smooth out the truck, pick up a little power and maybe a few mpg's
