Davis Unified Ignition (D.U.I.) AMC Street/Strip Distributors offer serious firepower and remains the most popular choice over stock ignition systems. These distributors have everything for your ignition system packed into one simple unit. No external coils or spark boxes are needed, just one 12 volt hot wire hook up sends 50,000 volts of pure spark energy to the plugs for a cleaner, crisper, more powerful running engine. A special weight and spring assembly is hand fitted and dialed-in for a precise timing curve that will match the specifications of your engine and vehicle. The super smooth advance provides instant throttle response and maximum power throughout the rpm range with no pre-detonation. Vacuum advance is provided for improved fuel economy and efficiency. Whether your engine is bone stock to highly modified, D.U.I.'s distributors deliver quality, reliability and performance that is unmatched.