if your looking for original equipment turbo then the only thing i can suggest since you don't want anything aftermarket is to directly to toyota for it. and as for problems, they have a problem with blowing headgaskets due to under torqueing of head bolts from factory. Installing a metal headgasket, of course after you make sure the head isn't warped and check the mating surface of the block, will pretty much solve your problems. But no need to go ahead and change it until it blows, unless you rather just do it as a precaution.
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