its a snap to make intercooler pipes, you just have to order the bends, and couple them together with silicone couplings.
as far as the 14b, yes it will work splendidly,
now you need a 2nd gen manifold, an o2 sensor housing, oil feed line, and return line, and some fittings so you can run coolant through it.
to check the turbo,
first try to spin the shaft, it should spin rather freely. if its from a motor that has sit for a long time and theres no oil on the bearings, it may resist slightly, but it should still turn. put you finger on the nut in the middle of the copressor blades, now try to muve it around, back and forht , side to side. if it doesn't move at all your in great shape. its okay if it jiggles slightly, but if you have more than a couple of millimeters of play, you probably have a damaged compressor wheel by now. it will still work, but its not going to make as much boost, and you should reall think about replacing it.
inspect the turbine housing, is there any signs of oil residue? examine the metal that the housing is made of, are there any cracks? if there are, how cad are they? tiny fractures are okay, big cracks are not. examine the whole thing.
the 14b is a pretty durable turbo, i've seen a bunch of them used, and i've never ran into one that was bad off, but i've never seen a used t25 that wasn't shot.
there are other things you will need for your project of course.
why don't you tell us what you have so far, iand i'll tell you whwat you have left
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