THUNDERMAX

ThunderMax is a U.S.-based performance tuning brand founded in 2003 by Thunder Heart Performance Corporation in White House, Tennessee . The company specializes in stand-alone ECM units with proprietary AutoTune technology, engineered for EFI-equipped Harley-Davidson motorcycles. These tuners replace the stock engine control module, offering features like wideband O₂ feedback, barometric correction, adjustable idle and rev limits, and an extensive base-map library