New XB4-driver, need advice

[Lowie]

Hello all.
Back into rc-racing after a very long pause (Dex410 and Darc)
I ordered an xB4 '17-edition and plan on building it asap.
Racing will be mostly on astro.

Could you guys please give some advice on needed spare parts?
As I have never builed/bought an Xray before, I don't know what parts will be provided: is there just one set of springs? pistons, swaybars,...?

Which parts should I get as spares and as tuning-options?
all advice appreciated