Vehicle voltage stabiliser?

[Firebottle]

For you techies out there, what is this unit meant to do, and how?

http://www.ebay.co.uk/itm/HIGH-PERFORMANCE-AUTO-CAR-VOLTAGE-STABILIZER-BLACK-GROUND-WIRE-EARTH-KIT-BLUE-/200976586496?_trksid=p2054897.l4275

It looks like complete snake oil to me, it even comes with `No instruction included` :scratch:

:cool: Alan

[Ali Tait]

Lowers the mains impedance so you get a better sounding engine note. :lol:

[Firebottle]

Sounds about right :mental: