This should clear it up. List of upgrades from the std kit
Features
Lightweight, hard-anodized aluminum chassis with centralized mass and mid-motor position for improved handling on high-grip offroad tracks
Chassis fits R.O.A.R.-approved 2S saddle packs and 2S short packs using optional foam insert
V2 12mm "Big Bore" threaded aluminum shocks with 3mm shafts and updated O-rings for improved smoothness
Aluminum rear ball stud mount for added strength
New 3-gear transmission for lower rotating mass and extra acceleration, with lightweight V2 aluminum top shaft included
Heavy-duty rear axle for added strength
Lightweight aluminum front axle/hex adapter and larger front wheel bearing for added durability
Factory Team upgraded ball bearing kit and titanium turnbuckles included
Aluminum rear clamping hex with laser etching
Heavy-duty ball cups and ball studs allow for maximum suspension travel while reducing binding and friction
Rear hubs feature larger bearings and the easy-insert system to adjust camber link position and rear toe-in
Team Associated B5M clear body and wing included