If that is your org ficm, then you should be good. VXCF4 was a good PCM program, and the FICM program that came with it was adaquate. VXCF5 is the bad one, it came with the ficm killer flash.
I'm sorry I dont have a FICM list to know exactly what FICM programs are good and which ones are not. I'm just a helper here. All I know is which one were married to which PCM code. So if your FICM is org then you should be Ok. I'm not saying you wont see some gains from a FICM reprogram, but they wont be a great as someone would see if they had later one like VXCF7 or VXCF9.
hope this helps
jeremy
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19 F-350 6.7 Auto
16 F-350 6.7 Auto
05 Excursion 6.0, Auto, PHP Atlas 40 FICM, ARP Studs VXBC6(truck PCM)
00 F-350 7.3, 12 Speed, PHP Gryphon, PHP hydra, DAC3
95 F-Superduty 7.3 DI, Auto, Mechanics Truck
94 F-Superduty 7.3 DI, 5 speed, Flatbed
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