none of the above posted by ghostZTT on January 20, 2004 at 02:53 AM
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They use huge wheels inside stock housings. Stock housings which are two small on the turbine side and to small on the compressor side. The diffuser area gets virtually eliminated and you get a laggy and peaky turbo.
Now I could be wrong about there rebuilds or upgrades but I would do some more research on these turbos to see if they are indeed reusing the stock housings or not.