ECM for 2021+ Bagger Models (without Center Cool Motor)
- Free shipping on this part
- Returns and exchanges: see our policy
- Questions? Call 715-235-3659 or chat with us on the site.
Description
ThunderMax Performance ECM: 2021 - up Harley Davidson® Baggers.
Boost Your Harley’s Performance with ThunderMax ECM
ThunderMax is an industry award-winning performance ECM designed specifically for EFI-equipped Harley Davidson® motorcycles. This cutting-edge, stand-alone tuning system enhances your bike's rideability and power using proprietary AutoTune technology and wide-band oxygen sensors. Whether you’re a weekend rider or a seasoned Harley enthusiast, ThunderMax guarantees unmatched performance and ease of installation.
Key Features of ThunderMax ECM
AutoTune Technology for Precision Fueling
ThunderMax’s AutoTune technology uses wide-band oxygen sensors to continuously adjust fueling points every 1.5 degrees of throttle and every 256 RPM. This results in a smoother-running engine with precise control over your bike’s fuel map, ensuring peak performance at all times.
Easy Installation with No Wire Cutting
ThunderMax is delivered 100% assembled and ready to install. Simply replace your factory ECM and oxygen sensors with ThunderMax, load a map, and you’re set! No wire-cutting or splicing is required, making it an ideal solution for both DIY mechanics and professional installers.
Real-Time Feedback for Optimal Performance
The built-in barometric sensor adjusts for ambient air changes, ensuring consistent performance no matter the conditions. Wide-band O2 sensors provide live, real-time feedback to the ECM, so changes are immediately written to the system once the key is turned off—no need for manual acceptance.
Full Customization with ThunderMax Tuning Software
ThunderMax is fully adjustable using the ThunderMax tuning software, allowing you to fine-tune the system to your exact preferences. Alternatively, you can simply load a pre-configured basemap and hit the road. The choice is yours, giving you ultimate flexibility in how you tune your Harley.
Why Choose ThunderMax for Your Harley Davidson®?
With ThunderMax, you get a highly advanced, reliable tuning system that ensures your Harley runs smoothly, efficiently, and powerfully. Whether you’re looking for simple installation or full customization, ThunderMax is the perfect choice for serious riders who want the best performance and rideability from their EFI Harley Davidson® motorcycles.
Installation Instructions
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.
Part Number: 309-591
*Excludes 2023-2024 CVO®(VVT) and 2024-Up Center Cooled Motors
Trike Models with RDRS: Please email support@thunder-max.com prior to installation for an updated firmware file.
Fitment:
2022–2023 FLTRXST Road Glide ST
2022–2023 FLHXST Street Glide ST
2022 FLTRKSE CVO Road Glide Limited
2021–2024 FLHRXS Road King Special
2021–2024 FLHTK Ultra Limited
2021–2024 FLTRK Road Glide Limited
2021–2023 FLHX Street Glide
2021–2023 FLTRX Road Glide
2021–2023 FLHXS Street Glide Special
2021–2023 FLTRXS Road Glide Special
2021–2023 FLHTPI Electra Glide Police
2021–2022 FLHT Electra Glide Standard
2021–2022 FLHXSE CVO Street Glide
2021–2022 FLHR Road King
2021–2022 FLTRXSE CVO Road Glide
2021 FLH Electra Glide Revival
2021 FLHTKSE CVO Limited
Fitment
Fits Harley-Davidson FLTRXST Road Glide ST - 2022 to 2023
Not sure it fits your bike? Call 715-235-3659 or chat with us on the site and a tech can confirm it with you.
Specifications & Installation
| Brand | ThunderMax |
|---|---|
| Part number | 106411 |
| Product type | Tuner |
| ThunderMax Performance ECM | 2021 - up Harley Davidson® Baggers |
| Trike Models with RDRS | Please email support@thunder-max.com prior to installation for an updated firmware file |
Videos
Want it installed right? Book the Nowaskey Speed Shop or call 715-235-3659.
Questions Riders Ask
Will this fit my bike?
Fits Harley-Davidson FLTRXST Road Glide ST - 2022 to 2023.
Save your bike with Shop by Bike and we check it for you. Not sure? Call or chat with us on the site and a tech can confirm it with you.
What's the part number?
Manufacturer part number 309-591 (ThunderMax). Our item number is 106411.
Can I install it myself?
Most riders with basic tools and a service manual can. The Specifications & Installation tab lists difficulty, time and guides where we have them. Prefer a pro install? Book a Speed Shop slot and call to check current availability.
Who do I talk to after I buy?
Our techs. Call 715-235-3659 or chat with us on the site and you will reach the people who know these parts.
Still have a question? Call 715-235-3659 or chat with us on the site.
Premium Performance Parts
Race-proven suspension, front ends and brakes we stand behind
Track-proven Performance
Nowaskey Extreme Performance is a Harley-Davidson suspension and performance shop in Menomonie, Wisconsin. We design our own shocks, fork cartridges and front-end packages, test them in King of the Baggers racing, and back Nowaskey-brand products with a lifetime warranty.
Every setup is matched to your bike, your weight and the way you ride.