MSD Ultra 6AL Ignition Box With Rev Limiter Red # MSD6423Ignition Box, MSD Ultra 6AL, Digital CD, with Rev Limiter, Red, Each Compact design full MSD power. Bluetooth service only available within the USA and Canada. Bluetooth service not compatible for use in Australia. Ignition Box Output: Capacitive discharge Circuitry: Digital Rev Limiter: Yes Timing Retard: One stage Data Acquisition: No CD Voltage Output to Coil: 520 540 V Current Draw: 0. 8 amps per 1,000 rpm Spark Output (millijoules): 150 mJ