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Unfortunately I don't have a Slot.It car in my collection (they really should do some rally cars in the future), but I compared the SRC Peugeot to several Ninco Renault Clio 1600's and Ninco Rally Raid cars with suspension.
This was done by pressing the rear wheels of the SRC Peug against the rear wheels of the Ninco cars.
It was always the Ninco suspension that moved first. The SRC Peugeot's suspension only moved after the Ninco coil spring suspension was fully compressed.
Conclusion: The SRC Peugeot suspension is stiffer than that of the Ninco cars.

Compared to the Team Slot Lancia Delta HF, the SRC Peugeot has softer suspension.
(In my Slot Car Magazine article, issue March 2024, about the Team Slot Lancia I already wondered whether the stiff springs are compressed at all while driving.)

I hope this gives you enough indication about the stiffness of the suspension of the SRC Peugeot.

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