I'm a newbie here, just got my first RC Slash 4x4 in December... having fun tinkering and learning about them.
I'm not sure they make much difference, but they look good... the Caster, Steering Blocks, and rear Carriers.
And some other nice toys for the TQi dock/real time feedback, installing the sensors was very easy and everything worked perfect. Not sure if the center differential magnet slows the rotation of the diff, hopefully not.
Temperature sensor and power tap for voltage...
And a few more tweeks, front and read sway bars, speed control cooler and clear diff cover
Looking forward to more mods!