I have the carbon chassis fitted on my C4.1 and one major benefit is the steering having driven others with just the alloy one on.
It also gives a little bit more room as the carbon braces are not needed and the weights are easily added/removed for different tracks.
As tony says above aswell, it takes the jumps better to.
This is only my opinion and I am no master, but can clearly feel the difference.
Paul
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