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ThunderMax®

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  1. Be the first to review this product

    As low as: $1,909.00

    Got your eye on a Screamin’ Eagle® or 120R H-D® engine? Zipper's ZIP KITS powered by ThunderMax® are the quick and easy way to simplify installation and power tuning on an EFI equipped big engine! In compliance with ARB emissions laws, this product is not sold or shipped to California.
  2. As low as: $2,425.00

    Stop cussing that early EFI system, just replace it! Zipper’s has taken the popular ThunderMax® EFI electronics and merged it with a single-throat Delphi®-style throttle body (with the help of some specially made parts) and developed this full conversion kit for bikes with H-D's earliest Magnetti-Marelli EFI systems. This kit allows you to retain the original wiring harness and gas tank, while upgrading to similar components used in the highly durable and reliable Deplhi®-based bikes of 2002-2005.

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

  3. Starting at $0.00
    ThunderMax® is an industry award winning, performance ECM designed specifically for EFI equipped Harley Davidson® motorcycles. This highly advanced, stand-alone tuning system utilizes proprietary AutoTune technology specificly designed to interface with wide-band oxygen sensors to automaticly adjust a wide range throttle positions and RPM ranges to deliver unmatched performance and driveability like no other product in the industry. ThunderMax® is made in the USA and comes 100% assembled, ready to install with no wire-cutting or splicing required. Simply replace the factory ECM and oxygen sensors, load a map, and enjoy your new ride! In compliance with ARB emissions laws, this product is not sold or shipped to California.
  4. Be the first to review this product

    $9.95
    For exhaust systems without installed oxygen sensor bungs. Drill pipe and weld in. Sold each, two required.
  5. Be the first to review this product

    As low as: $669.95

    Developed for professional ThunderMax® EFI tuners, ThunderMax® N.A.D.S. (Nitrous Assisted Dry System) gives engine builders and racers an easy-to-install “dry” nitrous performance solution. The N.A.D.S. system is 95% pre-built and requires no secondary fuel source for a clean, simple installation (ThunderMax® ECM required.) No bulky fuel pumps, fuel lines or sandwich plates required! Important Note: Intended for Use by Professional ThunderMax® Tuners Only! See Long Description Below for Additional Information. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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