Modified the cigarette lighter with a voltage gauge and 2x USB charging ports, which is way more relevant nowadays.

Took some small modification to make it work, but it looks good and is very useful.

The OEM unit as is
Rearside, you have to remove the KeylessGo module and a small bulb holder. Then use some force to push the plastic retaining clips and wiggle the cigarette lighter out
End result
This is how it looked like on the Mini