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I would recommend a system with a PROM chip. This chip can be reprogrammed to the fuel map that works for your truck. If one of these other systems get it wrong, the whole throttle body would have to be sent back for reprogramming as I assume the computer is attached. I would also get a system that has an OBD port for a scan tool or some other interface so you can capture live data. These two things make it much easier to deal with problems.
