THUNDERMAX EFI SYSTEM. PN#309-588. APPLICATIONS; M8 models. 2017 - 2020 Touring® Models - Air & Twin Cooled (Throttle-by-Wire). 2017 - 2018 Trike Models - Air & Twin Cooled (Throttle-by-Wire). EXHAUST NOTE; 18MM LAMBDA SONDE. Installing a
