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I have all four CPS. the original, still good, has good mileage, new black with gold terminals, has good mileage, new grey, bad mileage, and the new purple grey, kind of in between for mileage. So I'd go with the new black or the new purple grey. Some call that one blue, but it doesn't look blue to me. Just another note, the new black and the purple grey give the best perdel readings. The grey gives a #8 wacked out perdel. But that pretty much means nothing, it doesn't really matter for that fact, but I just want mine to be right, so I went new black as it had the best mileage and perdels.
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 2002 F350 Super Duty, Crew Cab,Long box,4x4, 7.3 PSD,Full Load, Edge Evolution Juice Attitude chip and tuner for motor and tranny with 5 settings and change on the fly, nice rims, BFG all terrain Tires, tire pressure monitors
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