IRS durability

Auto or manual? 5-speeds (like Chris K's car) can be harder on the half shafts than the autos, at least from what I've seen.
 
this is probably no help to you but since you said "an IRS" instead of "a supercoupe IRS"...

the IRS in my FC RX7 has held up great to over 500RWHP...
 
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