The 8mm chassis gives more rear weight bias where the soft chassis is to provide more traction on bumpy tracks, there is a difference in the two.
If you find the car has enough traction now and just want more stability in the rough stuff go to the soft chassis. If you don't have enough forward traction switching to the 8mm chassis will fix that.
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SHUMACHER CAT SX
SHUMACHER COUGAR SV
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