Some car/engine that use only two coil packs for a 4 cylinder engine.
In which the cylinder 1 and 4 fire at the same time, at one of which cylinder the spark was wasted.
The system was called Wasted Spark.
The inside architecture is quite the same as the oem K20A COP
But we change the winding and some advance design.
The most difference is that there is no ignitor inside.
Controller and the harness.
At some points of the stock wiring, inline installation is made with two opposit gender connectors
to reach and share the signals in the stock harness, also the power supply.