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Ceramic internals

My last car celica gt4 had ceramic internals and was over 10years old and ran nitrous at 75bhp for about a8 months with no probs. My current overdraft creator - R33gtr - has twin ceramic turbos and has 70kmiles running about 350-380bhp for most of that and has no problems.
As far as I'm aware the internals on standard turbos are fine within their boost range for reliability - it's only if you push them outside of their tolerances that they have problems.

I'm not mechanically inclined but this is what i've picked up

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