Increase performance and simplify the ignition system in your boat by installing our Marine DUI Distributor! The Marine DUI (Davis Unified Ignition) is a one-piece distributor that is virtually waterproof and will withstand the severe vibrations of a marine engine. The DUI is a complete ignition system in one simple unit. No external coils or ignition boxes are necessary! Just one 12 volt hot wire hooked up to the DUI is all you need to get your marine engine running with more power and torque. Improved performance comes from our 50,000 volt coil and high dwell Dyna-Module. The coil allows spark plug gaps to be opened up to .055?. The increased dwell within the module makes the coil produce a longer duration spark. The combination of the two will provide the most complete burn of the fuel mixture possible. Performance is also enhanced from the super smooth advance curve tuned into the DUI. A special weight and spring assembly is hand fitted and dialed-in using a distributor machine for a precise timing curve that will match the specifications of your engine and boat. The custom tuned advance provides instant throttle response and maximum power throughout the rpm range.