Well, for bashing or racing, you'll need a Slipper Clutch (or the Double Slipper) for a 7700 kv, and you might want to invest in the TRF501 diff halves for the rear diff too, unless you've glued 'em up good. Perhaps the reinforced drive belts too.
Other than that, CVDs are nice, better shocks a must for racing, and you might want to consider some carbon reinforced or alu suspension mounts/blocks, although the standard plastic stuff is already really tough.
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