ThunderMax ECM Integral Auto Fuel Management System Harley Touring 2021+

BRAND NEWPART# 309-591

Fitment: 2021 and up Touring models

Thundermax Electronically Commutated Motor (ECM) with Auto Tune

2 wide-band Bosch 5-wire oxygen sensors (18 mm) with AutoTune connection harness
ThunderMax quick start easy install and printable comprehensive users manual

Never outgrow it – easily accomodates bike change. No Dyno required – automatically tunes for riding style and riding conditions

ThunderMax is an industry award winning, performance ECM designed specifically for EFI equipped Harley Davidson motorcycles. This highly advanced, stand-alone tuning system utilizes proprietary AutoTune technology with wide-band oxygen sensors to deliver unmatched performance and rideability. ThunderMax comes 100% assembled, ready to install with no wire-cutting or splicing required. Simply replace the factory ECM and oxygen sensors, load a map, and enjoy your new ride!

100% engineered and made in the USA
Easy to install and simple to use