Plug It In Ur Cigeratte Lighter For 100 More Horses...!
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Vehicle: 2001/Hyundai/Tiburon
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Vehicle: 1997 Hyundai Fx Coupe
^ It's some kind of voltage stabilizer. The gains are fairly small but gains are gains & some people reckon the other benefits (brighter lights, better sound, etc...) are worth the dosh anyway.