Judging from your signature I'm guessing you will be running stock. A lot of people pick up the DIMEC chassis to make their cars lighter/give more flex.
I would recommend aluminium RF suspension holders for a durability increase, though the plastic ones will hold up fine if you don't crash too often
A carbon or aluminium steering rack is recommended too, but being a team drivers car he probably already has one.
A small thing to upgrade is the battery thumb nuts, the stock plastic ones can be a pain when you're in a hurry.