Your just asking for it, especially since you have a 03 with PMR's. If it was a 99 or 00 you would probably be ok in small doses.
I had it on my 00 for 9 yrs and finally took it off, I never blew the engine but I did'nt see the mpg gain vs. cost of the additional propane to justify it. It had a nice power gain though.
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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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