Those decals are to line your car up to the center of the lane. Look between them for the straight line. The decals Johnny is talking about are the ones that add horsepower, such as anything that says Banks Power, or Garrett. Those decals can be found on ebay, and are guaranteed to improve horsepower. Make sure you buy 2 though, as they only work for the side of the jeep that you stick them on. It needs to remain balanced for better mileage.