Sierra 18-99259 Marine Electronic Switch Box Assembly MercurySierra SIE-18-99259 High Performance Ignition Pack is designed for Mercury high-performance outboard applications, delivering reliable ignition performance for demanding marine engines. This replacement ignition pack replaces CDI 214-7778R 2 and multiple Mercury OEM part numbers, making it an ideal solution for maintaining ignition system reliability and engine performance.Compatible with select Mercury 3-cylinder and 6-cylinder high-performance engines, this ignition pack is engineered for dependable operation in marine environments and is suitable for a wide range of high-performance applications.Key Features High performance ignition pack for Mercury outboards; Replaces CDI P/N: 214-7778R 2; Replaces Mercury P/Ns: 332-7778A2, 332-7778A4, 332-7778A14, 332-7778A15, and 332-5524A2; Designed for select Mercury 3-cylinder and 6-cylinder engines;