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ThunderMax with Auto Tune 2017-2020 M8 Touring FLH/FLT

NOTE: This product has the following shipping restriction(s):
  • This product cannot ship to California.
Pricing: $1,088.95

NOTE: This product has the following shipping restriction(s):
  • This product cannot ship to California.
Free Ground Shipping


Fuel Moto will load the appropriate base map into your T-Max before we ship, we've been a T-max dealer since 2007 and have our own database of maps, including tunes for assorted aftermarket cams & big bore applications

Now available for 2020 RDRS models; if your bike is equipped with RDRS please make sure you let us know in the programming notes during checkout when it asks for your bike & modifications.  

ThunderMax is an industry award winning, performance ECM designed specifically for EFI equipped Harley Davidson® motorcycles. This highly advanced, stand-alone tuning system utilizes proprietary AutoTune technology with wide-band oxygen sensors to deliver unmatched performance and rideability. ThunderMax comes 100% assembled, ready to install with no wire-cutting or splicing required. Simply replace the factory ECM and oxygen sensors, load a map, and enjoy your new ride

Every degree and a half of throttle; every 256 RPM, there is a fueling point that is automatically adjusted. 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 our ThunderMax tuning software or can be used just by loading a basemap. The choice is yours.

Fuel Moto is an authorized Thundermax Premier Dealer and dyno tuning center. 


Product Series

Application List

Fitment for 309-588


  • 309-588
  • 309-588
  • Thundermax
  • New


Product Series

Shipping Information

  • Item Requires Shipping
  • 5.0 lbs.
  • W10.0000” x H4.0000” x L10.0000”
  • Free Ground Shipping