Skip to Main Content
My Store
Open Tomorrow At 10am
3635 West Broad Street
Columbus, Ohio 43228
614-869-3115
What’s going on at Cycle Gear
Services
Experienced staff support available on site
Store Events
Meet the local riding community for Bike Nights & more
Shop the Store
Find out what’s in stock and ready to go
Columbus
My Store
Open Tomorrow At 10am
3635 West Broad Street
Columbus, Ohio 43228
614-869-3115
What’s going on at Cycle Gear
Services
Experienced staff support available on site
Store Events
Meet the local riding community for Bike Nights & more
Shop the Store
Find out what’s in stock and ready to go
Search Suggestions
Menu

Uh oh - Our system doesn't think this part will fit your 2021 Harley Davidson Softail Heritage Classic FLHC (change vehicle selection)

Closeout

ThunderMax ECM Performance Auto Tuner For Harley Touring 2017-2020

Item: P998493
Current price is $989.99
Fast Lane

Members get up to $64.50 in total value with this purchase.

Ships Free to Cycle Gear Stores!

Ship to an Address:
Please select a to view availability.

Quantity
Add to Cart

Pick-up in Store:
Cycle Gear Columbus Check Nearby Stores

The Cycle Gear Difference

ThunderMax ECM Performance Auto Tuner For Harley Touring 2017-2020 Instructions

ThunderMax ECM Replacement w/ Auto Tune For Harley

The ThunderMax ECM With AutoTune is the high-tech way to manage every aspect of your fuel curve for the best possible throttle response and performance! Unlike piggyback tuners that simply modify your ECM (electronic control module) the Thundermax completely replaces it! Consider it a brain transplant for your bike! The true closed-loop system continuously self-adjusts to properly tune the motorcycle's air/fuel ratio for all riding conditions. If you start at sea-level and ride up to a mountain pass, the ThunderMax will automatically adjust your tune to keep your engine running cool and happy!

The ThunderMax system utilizes wide-band O2 sensors, along with your bikes factory sensors to monitor and adjust your air-fuel ratio in real time! That means more control and a smoother running engine. With the built in barometric sensor you never have to think about ambient air changes. WideBand O2 sensors constantly read the Air Fuel Ratio and give live, real time feedback to the ECM. That means, no “accepting” the changes made to the map, once you key off the changes are written. The ThunderMax ECM is fully adjustable with their free tuning software or can be used just by loading a base map. 

Features:

  • Mounts in place of factory ECM
  • Real time auto-tune adjustments
  • Start with a base map then let auto tune dial in your ride
  • Compatible with high-performance camshafts, turbo, nitro and superchargers
  • Monitor, record and analyze diagnostic codes and stats
  • Free firmware, tech support and updates

Note: System requires 18mm O2 sensor ports to accommodate the wideband sensors, stock pipes will need to have the 12mm bungs removed and 18mm bungs welded in place.

Read More
Please review this product's fitment notes & exceptions prior to purchase: Add to Cart

Uh oh - Our system doesn't think this part will fit your 2021 Harley Davidson Softail Heritage Classic FLHC (change vehicle selection)

Fitment Notes & Exceptions
  • This product is not legal for street use on an emissions-controlled vehicle. It may be used on dedicated competition or pre-pollution-controlled vehicles only.
  • Will require the use of an exhaust system with 18mm sensor bungs or head pipes must be modified to accept 18mm sensors.
  • Works with or without RDRS. (Traction Control)
  • Will not work on trikes with traction control.

This Product Fits:


Harley Davidson
Electra Glide Standard FLHT 2019, 2020
Electra Glide Ultra Classic FLHTCU/I 2017, 2018, 2019
Electra Glide Ultra Limited CVO/SE FLHTKSE 2017, 2018, 2019, 2020
Electra Glide Ultra Limited FLHTK 2017, 2018, 2019, 2020
Electra Glide Ultra Limited Low FLHTKL 2017, 2018, 2019
Freewheeler FLRT 2017, 2018, 2019, 2020
Road Glide CVO/SE FLTRXSE 2018, 2019, 2020
Road Glide FLTRX 2017, 2018, 2019, 2020
Road Glide Limited FLTRK 2020
Road Glide Special FLTRXS 2017, 2018, 2019, 2020
Road Glide Ultra FLTRU 2017, 2018, 2019
Road King FLHR/I 2017, 2018, 2019, 2020
Road King Special FLHRXS 2017, 2018, 2019, 2020
Street Glide CVO/SE FLHXSE 2017, 2018, 2019, 2020
Street Glide FLHX/I 2017, 2018, 2019, 2020
Street Glide Special FLHXS 2017, 2018, 2019, 2020
Tri Glide Ultra Classic FLHTCUTG 2017, 2018

This item is also available for 27 other models:

Harley Davidson
Electra Glide Classic FLHTC/I 1999-2001
Electra Glide Standard FLHT/I 1999-2001
Electra Glide Ultra Classic FLHTCU/I 1999-2001
Night Rod Special VRSCDX 2007-2017
Night Rod VRSCD 2006-2008
Road Glide CVO/SE FLTRSEI2 2001
Road Glide FLTR/I 1999-2001
Road Glide SE FLTRSEI 2000
Road King Classic FLHRC/I 1999-2001
Road King FLHR/I 2000-2001
Softail Breakout 117 FXBR 2023-2024
Softail Fat Bob 114 FXFBS 2021-2023
Softail Fat Boy 114 FLFBS 2021-2024
Softail Heritage Classic 114 FLHCS 2021-2024
Softail Heritage Classic FLHC 2021
Softail Hydra-Glide Revival 114 FLI 2024
Softail Low Rider S FXLRS 2021-2024
Softail Low Rider ST FXLRST 2022-2024
Softail Slim FLSL 2021
Softail Sport Glide FLSB 2021
Softail Standard FXST 2021-2024
Softail Street Bob 114 FXBBS 2021-2024
Street Rod VRSCR 2006-2007
V-Rod Muscle VRSCF 2009-2017
V-Rod VRSCA 2002-2006
V-Rod VRSCAW 2007-2010
V-Rod VRSCB 2004-2005
Product Style Item # Store SKU Manufacturer Product # Availability
Product Style ThunderMax ECM Performance Auto Tuner For Harley Touring 2017-2020 Item # 10223950 Store SKU 330283 Manufacturer Product # 309-588 Availability Only 3 Left: Ships within 24 hours
$39.99/yr.
Spend Less. Ride More.
  • 5% RPM Cash Back*
  • 10% Off Over 70 Brands
  • $15 in RPM Cash When You Join
  • Free 2-Day Shipping & Free Returns*
  • And more!
Become a member today! Learn More