my turbo is the T-70, .72/.84 from SSAutochrome.
And yes, it's hit and miss. My first one chucked the bearing, but it got replaced with no issues. But I'm saving for a garrett bb soon. This one was basically cheap enough for me to start out with so that making mistakes wasn't so costly. Now that I have a grip on everything, I'm moving on to something better. If you already know what you're doing (which I assume you don't if you're asking about ebay turbos) then go for something better right off.
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