6 tuning modes that covers all aspects of engine fuel requirements, including the ability to tune out back firing thru the exhaust (div)
Works with stock thru Big inch highly modified engines.
As an added bonus buy one of our exhaust with the AMS and save $120.00 on the combo, what could be better. Get THE BEST in performance and save a few bucks.
please let us know the year and model of your Harley-Davidson