These also have spares/upgrades:
https://www.tracksidespares.co.uk/pr.../carisma-gt24b
http://www.modelsport.co.uk/carisma-...roducts/394065
From what I've seen, only the alloy shocks might be worthwhile, carbon towers just add some bling, though if you want crazy speed you could go for the 12000kv motor alongside running 2s (not cheap though)