This ignition kit is revolutionary. This kit is made to use one distributor as a signal giver. The other distributor is only to point the spark to the right spark plug. With his one signal you are lost every differences of the timing of the second distributor. In the signal giver distributor you can program with I-phone or other android app the ignition curve any way you like to have it. The control box is a multi-spark system that increase the spark power by 60%. With the multi spark and the increasing power at the spark plug the chance of misfire reduces. With a better combustion the engine runs better at low RPM and lowers the amount off un burned fuel in the exhaust (HC). With the adjustable ignition curve the engine can be better tuned en the engine runs better over the complete power range. If you have more questions please mail us info@speedco.nl. This system is also available for stock 356 or 911 engines with the old HKZ-ignition.