Zippers Performance

ThunderMax® EFI Engine Management Systems

ThunderMax EFI Performance Products

ThunderMax LogoThe ThunderMax® with AutoTune EFI System is the industry’s most sophisticated performance EFI tuning system. Developed to meet the unique demands of Harley-Davidson® electronic fuel injection, the ThunderMax® with AutoTune device uses wide-band oxygen sensors to automatically adjust for your riding style and conditions - as you ride! ThunderMax® represents the finest in award-winning EFI technology, offering dealers and customers an easy to manage, top of the line performance tuning system - produced and developed entirely in the USA!

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