When I saw turnpike I knew you were an Okie...

I believe that most will suggest SCT with custom tunes my Matt @ Gearhead Performance. There is one other that writes custom tunes for the 6.0 but I can't remember who. This is on my wish list a long with head studs and 4" exhaust....

A lot of folks here have Scan Gauge II to keep an eye on things. The 2 biggies it doesn't read is fuel pressure and exhaust temps. That is because the truck does not have sensors for these items... Very much worth the money and can be bought or ordered from Auto Zone.