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The Hitachi series turbos can use Garrett T3 / T4 internals.
You should be able to find rebuild kits for "Garrett T3 / T4" turbos no problem.
Be very careful when ordering that carbon seal.
I've had rebuild kits where the carbon seal was loose banging around with all the other parts.
This causes the carbon seal itself to chip and end up basically useless.
Good vendors would carefully package the carbon seal separately.
The 360-degree thrust bearing would be used for higher boost.
I would not bother with it unless you're shooting for over 10 - 15psi of boost on a consistent basis.
Also, having a good (i.e. brand name aftermarket) BOV helps here.
The stepped piston ring is recommended if the price isn't that much more than the regular one.
I've had those things leak before, so they are not that much better than the regular butt joint ones.
-Ted
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