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Message: <blockquote data-quote="reivaxtorres" data-source="post: 451776" data-attributes="member: 8890">exactly. you can keep the COP of the new engine, but it involves a lot of rewiring. easiest thing to do is get rid of the COPs and just reuse the coil packs and wires from the NPI setup. as for the fuel system, you cannot mix a PI fuel system with an NPI fuel system. you have to go one way or the other. easiest way is to get the NPI fuel rails and install them on the PI intake. if not, then you have to convert it from a return style fuel system to a returnless style one, which involves replacing the tank, pump, and all lines.</blockquote>