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I have a 1991 GTS4, I can confirm it has ONE ceramic Turbo. The engine in this model is an RB20DET, which breaks down as...

RB = Race Bred
20 = 2.0 Litre
D = Double Overhead Cam
E = Electronic Fuel Injection
T = Turbo ...

If it were twin Turbo it'd be an RB20DETT .. an Idea that I have not yet fully dismissed given the availability of reasonably cheap standard turbos from GT-R's...

Reliability is an unknown for me as I've not run my car much yet, however I can confirm that its around £400 to convert the existing turbo to Steel innards...

Hope this is some help,

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