But I have to admit that I do have them on my car. Most of them are there mainly to lighten the drivetrain's rotating mass further.
The only hopup part that you would benefit from in the long run would be the aluminum front blade sway bar mounts. The stock ones are good but they would develop slop and strip the set screw holes over time.
I think most of the MTX-3 owners here on this forum hopup their cars because hopups are cheap and they love to personalize their cars. JustRC and RDLogic both sell low priced and high quality hopups that many can't resist.