Who runs ones? make any diffrence? when i have headlight on and use heaters or stereo my headlights dim a fair but so hoping something like this would help obviously im not wanting or believing better MPG or power as thats just snake oil i just want smoother idle and electrics http://www.ebay.co.uk/itm/Universal-Auto-car-Racing-Fuel-Saver-Voltage-Stabilizer-Regulator-Grounding-/181503165687?hash=item2a426e84f7:g:~9EAAOSwVFlT9w-v