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Free shipping to the continental 48 (Alaska & Hawaii orders, call to order).
All products have accurate in stock quantities listed, if it shows in stock it’s actually in stock!
Free shipping to the continental 48 (Alaska & Hawaii orders, call to order).
All products have accurate in stock quantities listed, if it shows in stock it’s actually in stock!

THUNDERMAX 1020-2664 309-588 ECM with Integral Auto Tune System Kit - '17+ FLHT

Original price $1,088.95 - Original price $1,088.95
Original price
$1,088.95 - $1,088.95
Current price $1,088.95


  • 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
  • Software program allows live monitoring, recording and examination of diagnostic codes and datalogs including number of starts, engine temperature and rpm operation
  • Utilizes wide-band O² 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
  • ThunderMax ECM with Auto-Tune module mounts conveniently in place of the factory ECM and plugs in to the existing harness
  • Easy installation: replace the factory ECM, install new O² sensors and harness, load the correct map for your bike, and ride
  • New maps, software, firmware updates, map analysis and tech support available online at no charge
  • Adjustable front and rear cylinder AFR maps, ignition timing (spark) maps, and startup maps
  • Works with all popular exhaust systems and is compatible with high-performance camshafts
  • Rider can adjust idle speed, rev limit and speedometer calibration
  • Improves throttle response, exhaust sound and driveability
  • Supports turbo, nitrous and supercharger applications
  • Does not require dyno tuning
  • Made in the U.S.A.
  • Does not fit 2020 Touring Models with Traction Control (RDRS)
  • Because of possible clearance issues, some aftermarket exhaust systems may require modifications or relocation of their O² sensor port bungs.


2020 Harley-Davidson Road Glide Limited FLTRK - -
2017-2020 Harley-Davidson Road King Special FLHRXS - -
2017-2020 Harley-Davidson Tri Glide Ultra Classic FLHTCUTG - -
2017-2020 Harley-Davidson Electra Glide Police FLHTPI - -
2017-2020 Harley-Davidson Street Glide Special FLHXS - -
2017-2020 Harley-Davidson Freewheeler FLRT - -
2017-2020 Harley-Davidson CVO Electra Glide Ultra Limited FLHTKSE - -
2017-2020 Harley-Davidson Electra Glide Ultra Limited FLHTK - -
2017-2020 Harley-Davidson Road Glide Special FLTRXS - -
2017-2020 Harley-Davidson Street Glide EFI FLHX - -
2017-2020 Harley-Davidson Road King EFI FLHR - -
2017-2020 Harley-Davidson Road Glide Custom FLTRX - -
2017-2019 Harley-Davidson Electra Glide Ultra Limited Low FLHTKL - -
2017-2019 Harley-Davidson Road Glide Ultra FLTRU - -
2017-2019 Harley-Davidson Electra Glide Ultra Classic EFI FLHTCUI - -

Fitment Disclosure

This quick reference fitment information is provided to direct you to our catalog information and the manufacturer's information. Consult manufacturer publication(s) and/or website(s) for specific fitment and application information and other important information. This fitment information is based upon the stock version of the motorcycle or unit referenced and any accessory added or other modification could invalidate the quick reference information provided.