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I wouldnt boost more than 8 psi on stock D-series internal without upgraded fuel system components. If you tamper with that internal wasgate rod, it will also prematurely divert flow away from the turbine which will cause "lag". The gate will be open all the time as mentioned....
You can still use an external wastegate with turbos that came off from other cars. You have to jam the gate shut by getting it welded in or find a way to plug it. Then just remove all the internal wastegate components off. You will have to get your turbo manifold modified for an external wastegate. Peace!
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