/Timing Control For Late Hemi Allows You To Run A Carb On Your Late Model Hemi As Well As Add Timing Controls MSD IgnitionThe Controller plugs into each coil pack along with the crank and cam sensors to provide you the ability to modify the timing curve, set a two step rev limit, nitrous retard or even a boost timing map! The 6 Hemi Controller is designed to operate with both styled coil packs that are offered on the new engines. A wiring harness for each application is sold separately. Hemi fans old and new will be excited to see that the 6 Hemi Controller will connect