Its really the preference of your tuner of choice. If you buy your tunes from someone who says they like VXCF9, then don't roll back. Bill prefers VXCF4 and that what he rolls most back to. Most tuners can't roll customers back and they have to work with the VXCF9, Bill doesnt. As it states on this website, VXCF9 isnt one of the better files. However, that doesnt mean you wont be happy with your tunes based on that file from your custom tuner.
The ficm program, wont effect your custom tunes so your ok there.
I hope that helps.
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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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