2017 - 2020 Harley Davidson Bagger ThunderMax ECM: The Best Performance Upgrade for EFI Harley Davidson® Motorcycles

Unlock Unmatched Performance with ThunderMax ECM for Harley Davidson®

ThunderMax is an award-winning performance ECM engineered specifically for EFI-equipped Harley Davidson® motorcycles. This advanced, stand-alone tuning system utilizes proprietary AutoTune technology and wide-band oxygen sensors to deliver exceptional performance, smooth rideability, and precise engine control. With ThunderMax, you can take your Harley's performance to the next level without any complex installation.

Key Features of ThunderMax Performance ECM

Effortless Installation with No Wire Cutting

ThunderMax arrives 100% assembled, making installation straightforward and hassle-free. Simply replace your factory ECM and oxygen sensors, load a map, and you’re ready to hit the road. With no wire cutting or splicing required, this plug-and-play system is perfect for DIYers and professionals alike.

AutoTune Technology for Precision Fueling Control

With AutoTune technology and wide-band O2 sensors, ThunderMax constantly adjusts fueling every 1.5 degrees of throttle and every 256 RPM to ensure smoother engine performance. This real-time fueling adjustment provides greater control, optimizing the air-fuel ratio and ensuring your engine runs perfectly in all conditions.

Built-In Barometric Sensor for Automatic Adjustment

ThunderMax’s barometric sensor automatically adjusts for changes in ambient air pressure, ensuring consistent fuel mapping and performance regardless of weather or altitude. Combined with the wide-band O2 sensors, ThunderMax continuously monitors and adjusts the air-fuel ratio, delivering seamless real-time feedback to the ECM.

Real-Time Feedback and Immediate Changes

One of the standout features of ThunderMax is the real-time feedback from the wide-band O2 sensors. Unlike other systems that require manual acceptance of map changes, ThunderMax automatically writes adjustments to the system as soon as you key off the bike, ensuring your motorcycle is always running at its best.

Full Customization with ThunderMax Tuning Software

ThunderMax offers full adjustability via the ThunderMax Tuning Software, allowing you to fine-tune the system to meet your specific performance needs. Whether you prefer a simple out-of-the-box experience with a pre-configured basemap or want to dive into detailed adjustments, ThunderMax offers complete flexibility for all riders.

Why Choose ThunderMax for Your Harley Davidson®?

ThunderMax is the go-to ECM for riders who demand peak performance and easy installation. With its advanced features like AutoTune technology, real-time fueling adjustments, and seamless integration, ThunderMax offers a smooth, powerful ride while ensuring your bike is always tuned to perfection.

Experience the ThunderMax difference today and elevate your Harley Davidson®’s performance without the hassle of complicated setups or installations.

Installation Instructions

Emissions Notice

This product is intended for "RACE READY" vehicles only and is not for sale or use on vehicles otherwise subject to emission control requirements.  In the state of California, this product should not be used on any vehicle that is registered for use on public roads. Please view the ThunderMax 50 application guide for "STREET APPROVED" & ARB compliant products.