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It's the IS housing. So aside from whatever comes standard, figure on being able to swap in:
2.937:1
3.583:1
3.909:1
4.083:1
4.100:1
Differential-wise, there's the OEM torsen (that might be the same unit that's in the ISF), an OS Giken, some other clutch type that I can't remember and whatever crappy viscous/open diff that comes in the vanilla IS.
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