The voltage regulator is built into the ECU. http://forums.2gnt.com/dcboard.php?az=show_topic&forum=4&topic_id=66028&mesg_id=66028&page=95 Eclipse RS : 5 speed15.7 @ 87.9mphJeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html