What edition did you get like the ultimate or platinum or just a stock one?
I have a Slash 4x4 fully built. here are the mods
All rpm parts including front bumper, rear bumper, mudflaps, front and rear shocktowers, ajustible height body mounts, and a-arms
Castle creations Mamba Max Pro with the 1415 motor, and castle link pc software to program fully for your track or driving style
front and rear sway bars
Bring shock weight oil up maybe 50wht, i have 70
Blue-anodized 6061-T6 aluminum C-Hubs
Blue-anodized 6061-T6 aluminum steering blocks
Blue-anodized 6061-T6 aluminum rear hub carriers
Get a waterproof rustler receiver box and mount it up front ( only if you want to i did on mine)
New wheels and tires ( I like Proline) - stock one's are okay i guess
gensacearespammers 3s lipo ( if you dont have one yet)
I only recomend cvd's ur your strickly racing, if your bashing to your better with the stock plastic's their cheap!
hope this helps