the vafc is a piggyback air to fuel controller. It wires into your ecu.
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would I be able to use others? or does this cancel out the usage of any other computer,
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this depends on what you're talking about, if you talking about another stand alone system (ie: hondata, AEM EMS) then yes. Those are much more powerful, expensive and harder to use/tune (the EMS anyway)
i suggest you figure out what route you're going to go first before you buy anything, and if i were you, i'd buy a kit, and pay to have someone install and tune it. otherwise, don't waste your money yet.