If you don't already have these then I would suggest the following :
- Steering and brake cam bearings
- RPM bumper
- rpm ballcups and rod ends (try and fix some of the steering linkage slop with better ballcups and ends)
- Lots of good foams ( SpeedMind, or Jaco )
- aluminum shock tower brace w/graphite shock tower
- RD logics dual chamber pipe
Other than that ... nothing else is needed. Don't waste your time on any aftermarket radio trays; I bought one and took it off and put the stock tray back on the same day.
The stock chassis is awesome for a few reasons :
1) There aren't a million cutouts in it -hence, less debris floating around ... less mess to clean-
2) Relatively inexpensive to replace when needed
3) Performance is nothing but stellar with the stock chassis; if you stiffen up the chassis, it just means more of the plastic on the kit will crack/break upon impact or any subtle flexes the chassis plate may have when breaking etc. You'd just be moving stress to another area stiffening up the chassis completely.
I personally love the blue anodized stock chassis looks
I however, still think the NTC3 is an ugly car compared to the belt cars ... but thats no matter; slap a sweet body on it! -your last item you can purchase with that $60 if nothing else-