THUNDERMAX ECU with Auto Tune - '18 Softail 309-589

Factory ECUs limit your Softail's potential, leaving performance gains on the table and throttle response compromised. The ThunderMax ECU with Auto-Tune replaces guesswork with precision—continuously self-adjusting your air/fuel ratio across all riding conditions without requiring expensive dyno time. Install it yourself in under an hour, load the map that matches your specific setup, and immediately feel the difference in throttle response, rideability, and exhaust note.

Key Features & Benefits:

• Plug-in installation—no wiring modifications
• Closed-loop auto-tuning via dual wide-band O² sensors
• Hundreds of pre-loaded maps available
• Live data monitoring and diagnostic logging
• Adjustable front/rear cylinder AFR maps
• Ignition timing and startup map customization
• Idle speed, rev limit, speedometer calibration control
• Turbo, nitrous, supercharger compatible
• Works with all popular exhaust systems
• Compatible with high-performance camshafts
• No dyno tuning required
• Free software updates and technical support
• Includes TMax software and USB cable
• Made in the U.S.A.
• Fits '18 Softail models

Installation Note: Bolt-on replacement for factory ECM. Some aftermarket exhaust systems may require O² sensor bung relocation.