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I have found some information that leads me to believe that all of these cars below use the same coil packs:

R32 GTS-T (RB20DET)

R32 GT-R (RB26DETT)

R33 GTS25t (RB25DET) .. up to 12/1994 only

R33 GT-R (RB26DETT)

.. these ones below all use a different part number from what I can see:

R33 GTS25t (RB25DET) .. 01/1995 onwards

R34 GT-T (RB25DET)

R34 GT-R (RB26DETT)

I have heard of gains in the area of 10-15% for torque and power, but I suspect this to be a little optimistic ... I think you could expect minimal gains but apparently it is noticable - I have never used these ones so I can't really say much else..

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