If you're going to a new turbo instead of rebuilding your current be sure that it will mate with your exhaust mani. While the turbo is off fabricate/buy a new intake ducting to fit your new turbo if needed. Also while it is off it is a good idea to replace the seals on the oil filter and oil pump, as well as cleaning out all of your manifolds. Basic upkeep of everything in that area is a lot easier with the turbo off.
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