Zippers Performance


The Power of Experience

Country Road Rider

Zipper’s Performance Products: The Power of Experience

For more than three decades, Zipper’s Performance Products has been the premier performance resource for professional technicians and performance enthusiasts of the Harley-Davidson® motorcycle. First established in 1978 by Dan Fitzmaurice and Dave Zehner, Zipper’s Performance had its humble beginnings in a homemade garage based in Maryland, building and selling competitive racing engines. In 1985, John Kitzmiller joined the group and Zipper’s Performance began to flourish as a retail resource for consumers.

Driven by the uncompromising pursuit of durability, performance, excellence and dedication to customer service, Zipper’s Performance Products grew despite difficult economic times and incorporated in 1981. Between 1985 and 1995, Zipper’s focus on drag racing yielded 5 National Drag Racing Championships and set over 60 National and World Records. Building for both power and reliability, this strategy was central to the phenomenal record of wins that catapulted the company into the public eye. The Zipper’s Team used the performance knowledge gained by racing to create street-to-strip performance strategies for riders of all kinds.

Zipper’s Performance Products continued to set the pace for Harley-Davidson® performance in 1999 by developing pre-engineered performance engine kits for Twin Cam® engines. The first in the industry to produce reliable performance kits, each kit was sold with a carburetor and ignition developed specifically for the package. These kits dramatically reduced the time and effort required to achieve repeatable performance results in customers’ motorcycles.   Fueled by the capability to develop, engineer, and manufacture sophisticated performance products, Zipper’s was able to build on the engine kit success by offering other juggernaut brands like: ThunderJet®, Red Shift® Cams, and Big Bore® Cylinders.

Zipper’s Performance Products has often initiated alliances with other industry leaders to develop technology that solves problems and improves the motorcycling experience. By 2003, Zipper’s Performance had joined forces with Thunder Heart Performance to develop the ThunderMax® EFI System. The two companies began to work together on a prototype controller for the Delphi based electronic fuel injection systems found on Harley-Davidsons®. Many loyal Zippers’ Performance customers participated in the testing; conducting real-world evaluations with test motorcycles.

By 2004, the product brand ‘ThunderMax®’ was adopted. Zipper’s Performance and Thunder Heart began marketing their EFI controller to the Harley- Davidson® aftermarket. For the next three years, the Zipper’s team canvassed rallies, trade shows, and special events, while visiting dealers around the world to demonstrate this ground breaking technology. The ThunderMax® EFI System proved to be a true performance solution for the EFI aftermarket, and represented the finest in award-winning EFI technology – offering dealers and customers a top of the line performance tuning system, produced and developed entirely in the USA.

Today, Harley-Davidson® enthusiasts want the flexibility to make performance changes on a whim without compromising power or economy. From stock displacement to 131” engine kits, Zipper’s Performance Products offers quality products to help meet every performance goal. Using ThunderMax® as the keystone for late-model Harley® performance, Zipper’s offers parts, kits, and machine shop services designed around the customer experience.  By recruiting the best people and maintaining a state-of-the-art operation, Zipper's Performance produces high value products and services that deliver thrilling rides mile after mile, and year after year.

Are you ready to feel the difference experience makes? Contact Zipper’s Performance Products today.