My personal truck is the 01 EX 7.3 2wd. I love it. I just recently started with the mods and yes, they do make a huge differance. I was happy with it stock also, I drove it many years that way and didn't have any complaints.
At work I drive a 05 F550 6.0 2wd with a boom.
The EX weighs in around 9,000, the F550 around 15,000 with the boom.
Stock, I am sure the 6.0 out performs the 7.3. But, the 6.0 has a huge turbo lag. This is the only one I have ever driven so I'm not sure if this is common in all. It also runs at a higher RPM so it tends to scream instead of Hummm like the 7.3. Even before the mods in the 7.3, I liked it better. Now with the mods I love it more.
Too bad I cant tweak the company truck. That would be fun.
I'm not into racing, I just like to have a little fun and enjoy getting there.
Good luck with you're hunt and either way you go I'm sure you will be happy.
2001 Excursion Limited 2X4
Zoodad, Marinco MOD, Rotella Synthetic
4" MBRP stainless turbo back, DIY Intake,
6 pos TW, Autometer trans-pyro-boost,
HP crossover tube.
** Newly added custom HYBRID tags **
2005 F550 Stock Company Truck w/ALTEC boom