This car doesn't NEED upgrades - it handles well, is easy to work on and durable out of the box (Yes, even the plastic hangers)
That said, Associated offers some upgrades that do help setup adjustability, like the rear hangers (wider toe- and anti-squat range) or the 3-gear transmission - which should prove a great feature for carpet and astro. In addition I offer a couple of parts for the B5M:
- +2.5 Degree Caster Inserts - Cars nowadays are refined enough to notice small setup changes - this insert offers the option to make such fine-tuning setup changes!
- Inserts for Bearing axles: For drivers that don't want to make the transition to hex front wheels! (requires Durango Imperial axles, TD33040)
- Screw-type Wing Mounts: No more floppy wing and no more body clips to get lost!
- Chassis Brace (Motor) with adjustable battery plate height: For when you run UnderLiPos in the car and don't want unnecessary tension in the chassis! (a flaw that many cars have imo).
More information is available in
this topic (on oOple)