Thundermax ECM W/Integral Auto Tune System EFI Tuner Harley M8 21-22 Touring

$1,115.95
SKU
ZP309-591

NOTE: Only for models without RDRS Traction Control (for RDRS models see P/N ZP309-591-RDRS)

ThunderMax PN#309-591 Applications:

  • Will not work with the Harley  RDRS

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!

ThunderMax Benefits Include:
  • Easy to Install & Simple to Use
  • Increased Engine Performance & Motorcycle Rideability
  • Cooler, Smoother Running Engine
  • Adjustable Idle Speed & Rev Limit Control
  • No Dyno Required - Automatically Tunes for Riding Style & Riding Conditions
  • Never Outgrow It - Easily Accomodates Bike Changes (Pipes, Cams, and More)
  • 100% Engineered & Made in the USA
  • 3-Year Factory Limited Warranty


ThunderMax System Includes:

  • ThunderMax Performance Engine Control Module (ECM)
  • Two (2) Wide-Band Bosch 5-Wire Oxygen Sensors (18mm) with AutoTune Connection Harness*
  • USB Communication Cable
  • (TMax software available on Thundermax website)
  • ThunderMax Quick Start Easy Install and Printable Comprehensive User’s Manual

NOTE: Only for models without RDRS Traction Control (for RDRS models see P/N ZP309-591-RDRS)

ThunderMax PN#309-591 Applications:

  • Will not work with the Harley  RDRS

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!

ThunderMax Benefits Include:
  • Easy to Install & Simple to Use
  • Increased Engine Performance & Motorcycle Rideability
  • Cooler, Smoother Running Engine
  • Adjustable Idle Speed & Rev Limit Control
  • No Dyno Required - Automatically Tunes for Riding Style & Riding Conditions
  • Never Outgrow It - Easily Accomodates Bike Changes (Pipes, Cams, and More)
  • 100% Engineered & Made in the USA
  • 3-Year Factory Limited Warranty


ThunderMax System Includes:

  • ThunderMax Performance Engine Control Module (ECM)
  • Two (2) Wide-Band Bosch 5-Wire Oxygen Sensors (18mm) with AutoTune Connection Harness*
  • USB Communication Cable
  • (TMax software available on Thundermax website)
  • ThunderMax Quick Start Easy Install and Printable Comprehensive User’s Manual
More Information
Finish NA
Drag Part # 1020-3514
Manufacturer Part No. 309-591
Ships Within: 24 Hrs

  • 2021-2022 Harley-Davidson Touring Milwaukee-Eight Models
  • Will not work with the Harley  RDRS

Manufacturer's Warranty

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