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I was actually wondering this same sort of thing. I have an early '99 with a cat and have noticed higher and higher EGT's over the past couple of months. It's not running as well as it had in the past, either.
I am leaking some boost around the intercooler up pipes to, which I'm sure is contributing to the higher EGT's.
Anyway, just thought I'd comment. I plan on cutting the cat and muffler off of mine anyway in the very near future. Hopefully that improves things for me.
Early '99 Supercab/Longbed 4x4 F-250
276k miles and counting...
Superchip Programmer, DIY Intake, 4" straight pipe exhaust and Transmission/EGT/Boost gauges.