Thunder Max M8 Tuner for 2018 - Present Harley Softail

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Product Code: 309-589
Availability: In Stock
$989.95

ThunderMax M8 Tuner Flyer

Our exhaust systems are designed around stock configurations. If your motorcycle has modifications such as Lowered Suspension, Shocks, or Aftermarket Saddlebags, the exhaust system may not work as intended.


*CALIFORNIA CUSTOMERS MUST SIGN AND RETURN THE WAIVER FORM BEFORE WE CAN BUILD AND DELIVER THE EXHAUST SYSTEM* CALL US FOR MORE DETAILS: (817) 834-8961

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 ride ability.  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:

  • 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




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