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A turbo, a manifold to hang it off, a new dump pipe and front part of exhaust.

Turbo oil feed lines and suitable source for the oil + return to the sump.  Turbo water cooling lines, with again, suitable source point and return.

Turbo inlet pipework.  New AFM (assuming you're sticking with stock type ECU - otherwise, you might be deleting the AFM).  New airbox/filter arrangement to suit whatever you choose there.

Front mount intercooler, plus pipework from turbo to throttle.

Bigger injectors.  Bigger fuel pump.

Suitable ECU.  Going +turbo is best done with an aftermarket ECU.  The DE ECU expects to see a boost sensor that you don't have and won't want, except to satisfy the ECU's demand to see it.  The DE ECU is not as well set up for a turbo engine.  I actually do not know if the DE ECU can even be Nistuned. I would assume it can.  You need to be able to Nistune it if you want to use a Nissan ECU.

Brakes.

And, the howto.  This has been covered many many times.  There are threads on here that you can search up on how to add turbo to RB25.  Look 'em all up.

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