Depends on what you are looking for... Fet is an issue it is a small chip that allows higher voltage engines to be put in. I Would not recommend doing this yourself unless you are a good solderer. If you want speed without a FET upgrade i would recommend buying the stage 2 engine at radioshack and adding a 6 cell upgrade and that puts you right under the voltage limit and your safe. I would also recommend AWD due to higher speeds you cant controll it without AWD. I would recommend either the supra or skyline being pretty easy to work on. There is also lights you can put on it called Command Logic and it is headlights and taillights you can also but their underglow kit (green only unfortunatly). Anything else i'll be glad to help you.
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Flat Black Supra
-Engine
Stage 2 Drift motor
-Exterior
Flat Black Custom Paintjob
Blue EL wire underglow (ordered)
Command Logic Lights (x2) foglights & extra taillights...
5Zigen Wheels
-Other Mods
AWD