Denso coils, known as 'CBR coils'. Commonly used on B series Honda engines.
These coils work great in COP CDI coversions for B and H series motors. Eliminate spark plug wires all together and have enough spark energy for over 1000hp. Must use Denso Iridium plugs, these coils attach to the plug by pressing on to the top, they require a plug that the tip can unscrew from. The Denso Iridiums are the only ones we've found that work well and come in the necessary heat ranges for high hp motors.