The difference between the independent ignition system and other ignition systems: 1. Different installation methods: the coil of the independent ignition system can be installed directly on the spark plug; other ignition systems cannot be installed directly on the spark plug. 

2. Different ways to the spark plug electrode: the voltage of the independent ignition system can go directly to the spark plug electrode without passing through the distributor or high-voltage ignition wire; other ignition systems need to pass through the distributor or high-voltage ignition wire to reach the spark plug electrode.