essential hop ups

[Si Coe]

From what I've seen on Tamiyas:

Ball cups and ballstuds

Rear diff (if not upgraded, possibly still)

Shock caps (if not upgraded)

Front shock tower (Atomic carbon do a great one)

Tools wise - whatever you need to build/maintain the car. Screwdrivers/Hex drivers, Wrenches, Pliers etc.