| the gt2860rs turbos did not come stock on the rb26. the s15 came with the gt2560r (gt28r) turbo. the gt2860rs turbos require compressor housing modification to join the stock IC piping to them, as well as clocking them, 5 bolt downpipes and actuator brackets fabbed. the gt2560r turbos require clocking, 5 bolt downpipes, and actuator brackets to mate to the exhaust manifolds. with either you will want supporting mods to allow sufficient exhaust flow to minimize lag, larger fuel injectors/intercoolers/exhaust manifolds/intake/ecu and internals at least
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