1) Yes
2) If you're racing you will want a center diff if you have that option. Watch
THIS to understand why.
3) Yes, you will want them for racing
4) Not familiar with this
5) Not as easily but if you're racing you dont want it to wheelie.
6) I would
7) dont need different shocks necessarily but you will have to play with the various oil weights and piston options (if any). This is part of "tuning" your rig.
8) Over the existing TRX engine? I would definitely get something more race worthy from a quality manufacturer.
9) Probably not but it depends on your local track. Theyre all different. Not many places race MTs anymore though.
10) In a MT class Id say probably so since it handles more like a big truggy rather than a MT.
11) Youd have to check with your local track. They can give you that info