The Delphi Ignition Tune-Up Kit - 135703 is a comprehensive set of products designed to improve the performance and efficiency of a car's ignition system. The kit includes various components such as spark plugs, ignition wires, distributor cap and rotor, and a fuel filter. These products work together to ensure that the engine receives the proper spark and fuel mixture for optimal combustion. By replacing worn or faulty parts, this kit can help improve fuel efficiency, reduce emissions, and enhance overall engine performance. It is suitable for use on a variety of car models and can be easily installed by a professional mechanic or experienced car owner.