The ThunderMax ECM Autotune Module replaces the factory engine control module on '21-'22 M8 models and tunes the bike continuously as you ride. A dyno tune is a snapshot: one day, one altitude, one temperature, one set of conditions. ThunderMax takes a different approach by replacing the ECM entirely and letting two wide band oxygen sensors feed corrections back in real time. The tune follows your riding style and the weather instead of being fixed to the afternoon it was made, and no dyno session is required to get there. How the ThunderMax Module Works Two wide band Bosch 5-wire 18 mm oxygen sensors ship with an AutoTune connection harness, giving the module direct feedback from both cylinders. Because it is a full ECM replacement rather than a piggyback, it accommodates future changes to the bike without being outgrown: new exhaust, new intake, new cam, the module adapts rather than needing to be replaced. Installation is designed to be straightforward, with a quick start guide and a printable comprehensive user manual. Engineered and made entirely in the USA. ThunderMax Autotune Specifications Fitments: '21-'22 Bagger and Touring, or '21-'22 M8 Softail Full ThunderMax performance engine control module, replaces the factory ECM Two wide band Bosch 5-wire oxygen sensors, 18 mm AutoTune connection harness included Automatic tuning for riding style and conditions, no dyno required Accommodates future engine changes Quick start guide and printable user manual 100% engineered and made in the USA ⚠️ VERIFY your model year and platform against the two fitment options before ordering.
