B18C1 or B18C5 will be a step up that mounts into your engine bay with no mods. Being a 99/00....that is the year needed for your chassis and smog. Just use your mounts and engine harness. B18C1 with need wiring for the secondary butterflies in OEM intake manifold ran to stock P72 ECU. Or run aftermarket IM (or bypass OEM) with a chipped ECU.
Too many options and threads to search that cover these topics. Good luck
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