TwinTurbo.NET: Nissan 300ZX forum - There is a difference as follows:
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Subject There is a difference as follows:
     
Posted by MixManMash on November 12, 2013 at 4:44 PM
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In Reply To Ok Im going crazy..GT25R and GT28R turbos posted by eriksu9 on November 12, 2013 at 02:50 PM
     
Message [ http://www.turbobygarrett.com/turbobygarrett/turbochargers ]

Select GT2554R and GT2560R and click compare.

The differences seem to be on the compressor side:

1. Inducer & Exducer sizes are different.
2. Because of the above, I believe the compressor housings would be different.

Basically, the only thing that would be usable would be the turbine housing. You would need new CHRA and compressor housing to convert it.

     
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