the front wishbones are a lot beefier on the SX2. the shock towers will break if you add an alloy gearbox top, but most cars shock mounts will break if you land on them badly enough.
the stegger brace will hold up the front pivot blocks much better.
It's generally pretty strong from my experience, and i've tested the strength a few times!
you can add alloy rear gearbox tops, but they aren't as essential as the front as the wing absorbs a lot of impact.
better quality turnbuckles would be a good idea as the kit ones can bend on bad landings.
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