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You should be running a front mount intercooler before running above 10PSI. The injectors are something that would maximize the upgrade, however you will need a piggyback fuel system or chipped ecu to get the true gains from the turbo and injectors. The fuel pump (if its stock) should be upgraded, though if you already have something like a walbro, 300ZX or Skyline GTR unit, you should be fine.
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