This is my upgrade parts list which I have accumulating for the big day. This is for my 2005 6.0 but is should mostly apply to the 2006. The updated STC fitting, HPOP screen, dummy plugs, stand pipes, turbo feed and return lines, and dipstick were parts that were re-designed and updated by Ford. They are things that should be installed during an oil cooler job as most of them can easily be accessed during this process. Most of these prices are from Tousley which has changed hands so I don't know if they are quite as cheap. There is some redundancy here depending on whether you buy a kit, etc.
http://parts.autonationfordwhitebearlak ... eid=214771
-OEM Oil Cooler rebuild kit - 3C3Z-6A642-CA
-Updated Oil Cooler Screen 3CZ-6C683-AB $7
-Standpipe & Dummy Plug Kit (contains 2 of each, everything in one kit) -6E7Z-9A332-B $102.30
Updated Turbo Oil Drain Tube -6C3Z-9T515-A $21.45
Updated Turbo Oil Feed Line - 3C3Z-9T516-A $77.00
Updated fuel regulator kit with blue spring Pres. Regulator Kit -4C2Z-9T517-AA $51.70
Updated STC kit w/ turbo gasket kit (incl. IPR screen and orings) -4C3Z-9B246-F $38.50
Thermostat housing with Tstat and oring --- Part # 3C3Z-8575-AA --- Online Price $20.90
Degas Bottle (Radiator fill bottle) -- Part # 6C3Z-8A080-B --- Online Price $57.64
Degas Bottle Cap - Part # RS527 --- Online Price $5.98
Intake manifold gaskets x2 3C3Z-9439-AA
Intake manifold set 3C3Z-9433-BJ
Updated blue EGR hose - 4C4Z-8592-AA
Updated IPR screen kit (with instructions) -3C3Z9H529A
Exhaust Back Pressure Sensor (EBP) part# 5C3Z-9J460-B $129.99 at River City Diesel
ICP (Injection Control Pressure) Sensor ICP 04-07 4C3Z9F838A $114.96 at Riff Raff Diesel
HFCM OEM Water Separator Drain Upgrade Plug 6E7Z-9C082-A $16.02 at Riff Raff Diesel
Turbo Reinstall Kit (mounting and gasket parts) 3C3Z-9T514-AG $9.87 at Riff Raff Diesel