The SVT parts held up in the test mule and Tom's first 3L turbo.
They've also held S/C cars which make strong top end power.
The Stage 1 is significantly higher rated then the SVT parts.
I really don't see it slipping.
Now the organic/metallic material will not withstand the heat like the Stage 3 but even the stock SVT clutch took my beating on it fairly well.
I am very hard on the clutch when it comes to launching and slipping the clutch.