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If it is 2"ish it is the hard pipe and is likely causing 90% of your problems and is definately the reason you can't boost over 4lbs. Hook it up. If it goes into the IC or intake hard pipe it is causing a boost/vacuum leak. Hook it up. If it was a water or oil line you would have water or oil EVERYWHERE. HKS makes a Sport turbo La-Z-Link I'm not positive, but I don't think these have water cooled CHRA's, in which case the water line won't be hooked up. These turbos are not listed as upgrades for the 300zx. JWT makes a Sport 550 Turbo that is based on the Stock Turbo.

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