Zipper's Performance Products 2010 Catalog Preview, featuring exciting, value-packed performance products for American V-Twins is now available as a free download. In the catalog, you will find "Best in Class" performance packages and components, including the Award Winning ThunderMax EFI System, Red Shift Cams and other Zipper's products designed to give your ride the winning edge.
For 29 years, Zipper's Performance Products has been on the cutting edge of improving the performance of Harley-Davidson® motorcycles. Since 2000, we've teamed with Thunder Heart Performance Corporation to develop ThunderMax EFI into the most user-friendly system available for your motorcycle. This product consistently rates at the top of customer satisfaction polls for ease of use, installation and outstanding results.
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