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jake brake is actually an exhaust brake. it closes the vanes on the turbo and creates a little boost and more back pressure. I think it turns off the injectors completly too and might lock the converter even if you don't have that option on, im not sure on that one.I've only used it a few times and don't remember exactly what I had on at the time, but it works pretty good. oh and I didn't have any option for the fan.
2003 f250 lariat 6.0 auto cc sb 4x4
leveled, 20x12 chrome hostages, 305/55r20s, 5" stacks, SCT livewire, billet grilles, custom vgt / s475 compound, custom built headers, ported heads, 6.4 valves, Hamilton springs, reworked pistons, delta cam, Florida converter, custom built 5r110, painted frame, chrome metalflaked valve covers oil pan and drive shafts.