1 / 2
THUNDER HEART PERFORMANCE
Engine Control Module with Integral Auto Tune System - '25 Softail
Part # 1020-4290
$1,088.95
Earn store credit on this purchase
In Stock
- 60-day returns
- Free shipping over $100
- Secure checkout
CARB Compliance: B — Not legal for sale in California
Confirmed fit for 10 motorcycle configurations across Harley-Davidson, model year 2025.
| Years | Make & Model |
|---|---|
| 2025 | Harley-Davidson Softail Low Rider ST FXLRST |
| 2025 | Harley-Davidson Softail Heritage Classic FLHC |
| 2025 | Harley-Davidson FXLRST Low Rider ST 117 |
| 2025 | Harley-Davidson Softail Low Rider S FXLRS |
| 2025 | Harley-Davidson Softail Street Bob FXBB |
| 2025 | Harley-Davidson FXLRS Low Rider S 117 |
| 2025 | Harley-Davidson Softail Fat Boy FLFB |
| 2025 | Harley-Davidson Softail Breakout FXBR |
| 2025 | Harley-Davidson FXBR Breakout 117 |
| 2025 | Harley-Davidson FLSTFI Fat Boy Gray Ghost |
- ThunderMax ECM with Auto-Tune module mounts conveniently in place of the factory ECM and plugs in to the existing harness
- Utilizes wide-band oxygen sensors and works as a closed-loop control system to continuously self-adjust and properly tune the motorcycle’s air/fuel ratio for all riding conditions
- Easy installation: replace the factory ECM, install new oxygen sensors and harness, load the correct map for your bike, and ride
- Includes ThunderMax ECM with Auto-Tune Module, plug-in harness and two wide-band sensors, TMax software and communication USB cable, Quick-Start Easy Install and Comprehensive User’s Manual, technical support and free software and updates
- Hundreds of maps available to download for your bike (based on model, engine size, exhaust system air cleaner, pistons, cams, etc.) – load the map of your choice and the integral auto-tune will do the rest
- Improves throttle response, exhaust sound and driveability
- Rider can adjust idle speed, rev limit and speedometer calibration
- Adjustable front and rear cylinder AFR maps, ignition timing (spark) maps, and startup map
- Works with all popular exhaust systems and is compatible with high-performance camshafts
- Supports turbo, nitrous and supercharger applications
- Software program allows live monitoring, recording and examination of diagnostic codes and datalogs including number of starts, engine temperature and rpm operation
- New maps, software, firmware updates, map analysis and tech support available online at no charge
- Made in the USA
- Because of possible clearance issues, some aftermarket exhaust systems may require modifications or relocation of their O2 sensor port bungs.
- Does not require dyno tuning.
Customer Reviews
No reviews yet — be the first to review this part.
Overview
The THUNDER HEART PERFORMANCE 1020-4290: Engine Control Module with Integral Auto Tune System - '25 Softail. Confirmed fit for 10 motorcycle configurations across Harley-Davidson, model year 2025. Ships from Greasemoto — a veteran-owned motorcycle parts shop in Fort Worth, TX — with free U.S. shipping on orders over $100.
Fits these motorcycles
- Harley-Davidson Softail Low Rider ST FXLRST
- Harley-Davidson Softail Heritage Classic FLHC
- Harley-Davidson FXLRST Low Rider ST 117
- Harley-Davidson Softail Low Rider S FXLRS
- Harley-Davidson Softail Street Bob FXBB
- Harley-Davidson FXLRS Low Rider S 117
- Harley-Davidson Softail Fat Boy FLFB
- Harley-Davidson Softail Breakout FXBR
- Harley-Davidson FXBR Breakout 117
- Harley-Davidson FLSTFI Fat Boy Gray Ghost