DYNA 4000 Pro Ignition: 
Must use DC9-1 or DC9-2. The DYNA 4000 ignition 
system is designed for racing only and is matched to the characteristics of the 
DC9-1 coil for optimum energy production. 
Recommended - DC7-1, DC8-1, DC10-1, DC3-1, DC6-1. 
Use coil with 5.0 ohms primary resistance for street use, 3.0 ohms primary 
resistance for racing applications.  
Single Plug Head: 
Single Fire - Use two single output coils, street 
or strip. 
Dual Fire - Use one dual output coil, street or 
strip. 
Dual Plug Head: 
Single Fire - Use two dual output coils, street 
only. 
Dual Fire - Use two dual output coils, street or 
strip. 
Dual Plug Head, single fire racing applications: 
Use two DC2-1, 1.5 ohm coils, connected in series 
for each cylinder. Since these coils are dual tower, one tower of each coil must 
be shorted to chassis ground. 
DYNA S (non-Harley): 
Recommended - DC1-1. Use coil with 3.0 ohms primary 
resistance.