The cost/benefit analysis doesn't support replacing the IMSB. Not even close.
I can walk y'all through the numbers, but you probably know them already.
That said, if I were replacing the clutch, I'd probably do it then just as a "while you're in there" item. But not otherwise.
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2004 Boxster S, 6 spd, Triple Black
1986 944 Turbo (sold in 1988)
Since then, a 300ZX, a few BMW 3 Series, a few VW's
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