have a look in the Kyosho section in here, there are a few threads of a similar question. Also look at the main ZX5 upgrade threads as a lot of that will apply to the RTR also.
But steel diff halves and front UJ's would be a good start as said, and what ever the tyres of choice are at your local club.
Some spare diff gears are always worth having as they can strip easily if not shimmed correctly, again tip son that in the kyosho section.
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