We have an Edge Evolution on our Excursion, was there when we bought it last fall, and by compairison to the DP Tuner in the yellow truck, I do not like the Edge. How it makes the trans shift scares me, and I plan to replace it with a DP Tuner as soon as funds (and the wife) allow. The only thing I like about it is it's gauge display function.
Gauges are a must if you have any kind of tuning. When stock, the PCM is so de-tuned that the EGT's never get out of hand... add any kind of tuner, and up the fuel, and you'll start upping the EGT's, and melt stuff... and never know it, if you don't have gauges. I hope no damage has been done in the years it's had the Edge on it...
Even a stock trans should have a trans temp gauge... a good brand-name, properly installed, and watched... even an empty single axle 6x12 box trailer has brought the trans temps up quickly, under certin conditions in my yellow truck, dispite it being a dually with low gears made for towing. Just goes to show, you never know, unless you know. I didnt', untill I got the gauges in, now I'm an info freak.
DIY intake/6637 filter is great bang for your buck... it's the first mod I'd make to any 7.3 truck I get, and straight pipe the exhaust. Stock exhaust is fine, it's the muffler that bottle necks down to 2.5" and is the restriction. Unless you're pushing 400 HP, stock is fine straight piped. Larger aftermarket exhaust will only change the tone, and is the only real reason to change it. Bottom line is get easily get air in (6637 filter), easily get air out (straight pipe the exhaust).
Good luck with your truck... nice to know you get to keep it in the family. Both my red truck, and my old chevy mudder were bought from a close family friend, almost like family, I'm proud to have them.
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
'00 F350 extcab, 9' utility bed, dually 228k
E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
'00 Excursion Limited, 7.3PSD 294k
'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k