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Do a leakdown test, get a tire valve, plug it in a vacuum line, get an air compressor with a tire inflater tool, put it at tdc (second notch from the left on the crank pulley lines up with the needle) and put pressure in the system. If you hear any hissing there's your leak, also spray wd40 or soapy water on the suspicious places. If you have a boost gauge you can test how long it takes for the air to leak out of the system which can tell you how bad it is leaking. Oh and don't forget to plug the turbo inlet!
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