so i was shopping online for different components for my focus, and i came across a voltage stabilizer. Now is this just a goofy trickery of wires to get people to buy it, or is it just like a resistor, (some of friends told me about the resistor), but anyways, its around 30 bucks with shipping included. I dont have a high-performance car or anything, i was just wondering if this could help me with my low-end rpm's and hp. I am new to this sort of thing if you cant tell, so input would be great.