From street legal to race only, from high power engines to user friendly Auto Tune Systems, from EFI Performance Components to Air Cleaners, and for 29 years Zippers Performance (also under the ThunderMax brand name) has been on the cutting edge of improving the performance of Harley-Davidson® motorcycles.
Not many companies in our industry carry products consistently rating at the top of customer satisfaction polls for ease of use, installation and outstanding results. And I have no problem to tell you in my Blog that all those that I know, pros or retail clients, who have dealt with Zippers’ sales and support staff, describe the company as extremely competent and friendly. Well, if you have any issue, question, want regarding improving your stock or custom bike performance, call them at 410-579-2828, or download their new 2010 catalog. Zippers Performance Catalog Download.