It's a noticeable improvement going from an E99 PCM to a 99.5-01 PCM regardless of what the later PCM code is.
However, if you're not into hauling things or racing, you probably won't notice a whole lot short of changed torque converter clutch apply strategies.
You can't go wrong by changing the PCM though so if it's something you want to try, then by all means go for it. I have swapped a few of them over and was told that it was the best modification that I did.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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