Just my 2ps worth...
I don't really understand why a new spur is a MUST!
Personally I found that the kit spur and pinion an excellent ratio for my 5.5.
You need some extra springs, granted. I used the tamiya option springs.
My standard turnbuckles have taken lots of abuse, did not break one all season (but could do with a decent spanner!)
personally i think any diff in our current 'power mad' climate can benefit from a ceramic ball upgrade.
Compared to many other cars the 501 is one tough cookie as standard! Not even the camber link is essential, having one in the box would be sensible.
Granted the standard screws are not titanium, but i have found them perfectly up to the job.
The sway bars are cheap as chips and you may be surprised at the effect they may have. The tamiya bars are very thin for adding 'just a little' positive effect. One on the front worked for me, toned the front one way agression down a notch.
I guess overall my take is that the extra cash could be used for more spares, motors, cells etc.... which could add more value in the long run.
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