Its not only the clutch plate but the clutch cover also - its the cover that can have an uprated clamping force, hence the clutch plate will handle more power.
So the same clutch plate could handle 300 Lbft or, say 400 Lbft depending on the cover.
I have an API uprated Exedy 5speed coverplate and 7kg lightened flywheel for sale - the clutch plate is worn out unfortunately.
It started slipping at 400Lbft and approc 430HP. I have been told these Exedy clutch plates are all the same, its the uprated cover that is the difference and cost difference.
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