Fuel / Air - Electronic Fuel Injection
As early as 1995, Harley-Davidson® began to offer EFI (electronic fuel injection) as an alternative to the traditional carburetor. Today, EFI Twin Cam® and Sportster® engines are the standard for all new Harley® models. Zipper’s Performance Products was the first aftermarket performance company to research, develop and manufacture performance products for these new hi-tech engines. In 2003, Zipper’s Performance joined forces with Thunder Heart Performance to develop the ThunderMax® EFI System. The research gained during the development of ThunderMax® System and our rich racing heritage made possible other popular products found in this category, such as high flow throttle bodies, performance air cleaner kits, and nitrous systems.
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