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After doing a search, i found that on those more modern vehicles, the ecu does the grounding. Im not sure which 4 wire systems have that property and which do not so i think im better off scoring a 3 wire. It's cheaper at the store anyway. I think i have some 3 wires used at home. Im going to install one of those and if my car behaves the same or better then great. if not then at least i have the oem plug installed and can replace with ease.
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