I would suggest replacing all belts and pullies as a matter of course unless they look mint because they are a pain to service trackside.. then if you are putting 6.5/5.5 brushless system in set your slipper carefully especially if on high grip.
Front shock tower strengthener definitely worth doing.
The rest is fairly robust really IMO.
Can do the CR rear end mod and the centre belt pulley mod but not essential.
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