Essentially what you are looking at is a plug and play kit that completely unlocks your E2. It will use the factory throttle, power button, kill switch, motor and battery. You will simply remove the old controller and install this in its place get your time the way you want it and start ripping. It's hard to list everything so here is some of it.

Increase the battery voltage to increase the top speed of the machine.

Increase motor current to give it more torque.

No more reverse throttle to start

No more tip over sensor

Disable the kill switch so it's no longer needed if you so choose.

Change the sleep timer settings 

Adjustable throttle curve to make it as smooth or snappy as you want.

Bluetooth connectivity for on the fly tuning and gauge pod read out.

Allows for future motor upgrades 

User profiles so it can be slower for the little ones.

installation guide is here