Harley Sportster Riders. Unleash The Ponies.


Newly added to its full line of Engine Management Systems for Harley-Davidson models, the ThunderMax Autotune for Sportster XR1200 allows you to maximize engine power performance with total control of your EFI system. It’s a complete replacement engine management system that replaces the stock Electronic Control Module (ECM). Not an add-on box or signal modifier. The ThunderMax is a high speed, high resolution processor designed to deliver uncompromising performance  and to autotune as you ride for any riding condition, any exhaust system. any riding style for optimum power and economy. If you need help finding expert installation for your ThunderMax system, contact Zipper’s Performance for details. 410- 579-2828, Zippers@ZippersPerformance.co

Cyril Huze