S1 has alot more flexability than the carbon pro. I believe that some of the team drivers used the S1 chassis. If you have instructions for SX3 it might be worth looking in there. I use the S1 chassis on my pro carbon. Never even fitted the pro chassis on. The best thing is to try both. It wont take long to swap chassus realy. all you have to do is take screws off from underneath when car is complete.
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