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just wondering how exactly is the 03 IRS different from the 99 and up?

Is the differential housing the same?

what kind of failures have you heard of? were they at the strip or daily driving failures?
 

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31 spline diff/halfshafts and pinion brace mainly, some other small stuff.

Plenty have been broken. The aluminum diff housings have actually broken on some cars. Plenty more have taken all kinds of power with no problems.
 
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