Weight difference between new S1 chassis and carbon fibre chassis.

[t.o. rob]

I just want to know if any one knows the difference in weight between the S1 chassis and the carbon fibre chassis. I want to put a little more weight on my car and I am not sure which chassis would be heavier. I want to add more natural weight onto my car without having to add lead weights. I am presently running the first carbon fibre SX chassis and it is very light.