another use if any one wants to just show off, i had them hooked on my 97 tahoe to my alarm system to where i could controll thm with the alarm remote on / off.
think as if some one is walking in front of ure car/truck at nigth u can make them jump by turning them on. i use to do this to friends and family its all for a good laugth.
on another note i got my truck fully tuned today shifting point at 6700 rpm . its a beast at any speed you can take off from a dead stop of at any speed and wont stop pulling.