New Owner

[mathsinstrument]

I am interested to purchase the predator for racing in my local tracks and I encountered some problems.

On the website, I saw 2 models which are available. The XRS Race Spec and the X11. What's the difference between the 2?
Looking from the website pictures, the XRS looks like the RTR version with plastic parts...
What are some essential spares for racing? Will be purchasing together with the kit....