Steering Servo upgrade would be good.
Roll Cage is also a good upgrade to keep from damaging your rig.
Not sure what brand of glow plug you use in your airplane engines....but the OS #3 & #8 plugs work very well in the 2.5 engine. I use these same plugs in my airplane engines and think they are worth the $$$.
Some guys use an on board temp gage to monitor the temps of the engine. Or...they'll by the Raytec temp gun so they can use it on several rigs if they have more than one rig.
The body posts are a weak spot if your flip or roll over. I have broken the rear ones as they are simply easy to break.
Some guys upgrade to RPM skids to protect the undercarriage. I would stay with the plastic parts for now...unless you stay on road and just want to show it as nice looking truck. For off-road....breaking a part is better than bending it...if it's an aluminum part....plus the aluminum gets expensive.
Congrats on your new TMaxx and good luck driving it.
