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You can't go by water temperature at all...as when you exhaust gas temps get high, they don't relate at all to water temperature. In most cases, water temps rarely move on most Powerstrokes unless there is an issue with the coolant system.
A pyrometer gauge is you best bet to know just how hot your valves are getting with whatever chip setting you happen to be using. Running around town isn't necessarily the issue, it's when you load your truck down, and head out of town in the mountains where you really need to watch your temps. There again, not getting into the throttle alot helps as well...at least until you have a pyrometer.
The 3" downpipe will help to rid yourself of some of the heat.
I added a intercooler as well, although it can still get too hot with my larger injectors and custom chip settings!
'09 F-450 King Ranch 4X4 Superduty 6.4 & 4.30 gears.