A few thoughts for you:
Make sure you have alloy steering arms, the plastic ones break immediately.
Alloy hangers/pivot blocks etc are expensive, not on the SX2 as standard, and probably a worthwhile upgrade.
4000mah 30C lipo's are the biggest I can personally find to fit comfortably in the SX2, I'm sure some larger will fit, but don't expect to run 60C/90C lipos.
Superglue is your friend. Any screws into alloy, and certainly the guide rings on the pulley (mine came free and destroyed a lipo).
IMO, the CF version of the SX2 is not worth the premium over the S1 at club level.
RCBearings stock full bearing kits for the Cat. Buy one.
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