40,000 volt output gives more reliable starting power, and greater performance at high rpm. 

These updated sports coils require a push-in coil wire. If you are upgrading an original screw-in coil you will need to change to push-in type plug wires.  

Videos
Ignition Coil - How to Test
Ignition Coil - How many Ohms
Ignition System - How to Test (Part1)
Ignition System - How to Test (Part2)
Ballast Resistor - How to Test