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For over thirty-two years, Zipper’s Performance Products has been the premier performance resource for professional technicians and performance enthusiasts of the Harley-Davidson® motorcycle. Zipper’s Performance set the pace for the rest of the industry by being the first to develop reliable, pre-engineered Performance Kits for Harley® engines. These Performance Kits dramatically reduce the time and effort required to achieve repeatable results. Whether you are considering a quick afternoon upgrade with a Zip Kit, or can’t wait to open the throttle on a big Muscle 120” Kit, Zipper’s Performance offers Performance Kits to suit every rider and riding style.