No new bike responds to intake, exhaust and tuner upgrades like a new Harley® – you’ve got to let it breathe, and optimize the tune! That’s why Zipper’s Performance Products developed these Zip Kits for Big Twins and Sportsters®, and this is why you should consider a Zip Kit over other offerings:

    • Proven, Matched Components That Work
    • Smoother, Cooler, Better Running Engine
    • More Power At All RPMS – More Useable 6th Gear
    • Improved Starting, Sharper Sound, Immediate Improvement
    • Ready To Install, No Dyno Time Required
    • Easy Installation, Just A Few Hours To Transform Your Bike
    • Never Outgrow it – Supports Future Upgrades
    • High Quality, USA-Made Components
    • Kit Price Includes Package Discounts

Included in a Zip Kit is a Zipper’s MaxFlow performance air cleaner, performance exhaust of your choice and the cutting-edge ThunderMax® with AutoTune EFI Controller. The ThunderMax® gives you the flexibility of future performance upgrades with a simple download of a new map. Bolt-on and plug-in the Zip Kit to enjoy the immediate power, cooler and smoother performance and ride-ability gains that ThunderMax® provides!

These Zip Kits for Sportster® models include a pre-mapped ThunderMax EFI module, MaxFlow air cleaner kit and high performance D&D Fat Cat or Bob Cat 2-into-1 exhaust systems. When ordering a system with a Fat Cat, you can choose the finish and baffle option; when ordering a system with a Bob Cat, you can choose a chrome or black head pipe and between three different muffler finishes.


This product is not for sale or use on pollution controlled vehicles.

Weight 1 lbs
Country of Origin


Head Pipe Color

Chrome Head Pipe, Black Head Pipe

Muffler Finish

Black Muffler Sleeve, Carbon Muffler Sleeve, Aluminum Muffler Sleeve

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