well, after hearing not so bad things about chinese turbo`s from nick at r-tech i went and bought one. it`s a k04-001 with a bit of a twist. it has a larger turbine and also a larger compressor which appears to be of k04-023 variety.
from a visual inspection it seems to be machined well and has been balanced.
i`m not expecting the world from this turbo and am using it as a bit of an experiment. it`s an old car and it`s not my daily anymore so if it breaks then it doesnt matter, i will fix it again eventually. (wether it be engine swap,rebuild ect ect)bla bla bla bits of turbine flying towards my face and all that..