the TA04-R includes many of the upgrades that you will need for competative racing. I have added some others to mine, but not sure that any are REQUIRED.
- carbon fiber shock mounts
- hard suspension arms (stiffer and better for carpet)
- different chassis plates (I have tub ..for GT2/3 class, saddle pack CF chassis, and stick pack CF chassis).
- titanium turnbuckles
- alum servo mounts
- front one-way
I also have aluminum steering system coming that I hope will help me tighten up the steering slop.
Some of the keys I have found are to make sure you balance the shocks to have identical rebound ....or you can go crazy chasing tweak!
I have a Evo3 that I will be running next weekend...and we will see how the ta-04r compares. I expect the evo3 to be more like my fttc3 for quick acceleration, but hope the handling is more like my ta-04r.
Good luck with yours!