ThunderMax
ThunderMax delivers advanced Harley-Davidson ECU tuning systems, auto-tune ECM modules and electronic fuel management controllers designed to optimize performance and efficiency. It is widely used for real-time fuel adjustment, throttle improvement and ignition control. Popular among riders searching for Harley ECU tuner, motorcycle auto tune ECM and performance fuel injection system. Built for Touring, Softail and Twin Cam models with plug-and-play installation.
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Out of stock
Thundermax - EA4100CHR-DS - Transmission Speedometer Sensor
ThunderMax
$90.95Thundermax - EA4100CHR-DS - Transmission Speedometer Sensor Features Chrome billet sensor Includes OEM Deutsch connector For use with stock-length starter motor on most '96-'03 Big Twin...$90.95 -
Thundermax - EA4250D-C - Electronic Harness Controller
ThunderMax
$369.95Thundermax - EA4250D-C - Electronic Harness ControllerFeaturesAllows a dual-filament bulb to be used in three ways: tail, brake and turn signal (excluding the need for a center brake light); includes...$369.95 -
Thundermax - EA4360 - Micro Harness Controller - Fits choppers and custom bikes w/ separate brake light (except 2004-2020 Big Dog w/ proprietary hand controls); choppers and custom bikes w/ separate brake light
ThunderMax
$406.95Thundermax - EA4360 - Micro Harness ControllerFeaturesPerforms all fuse, relay (includes starter relay) and signal-canceling functions in one simple packageProvides multiple flasher combinations...$406.95 -
Thundermax - EA4093 - Push Button Converter - Harley Davidson
ThunderMax
$46.95Thundermax - EA4093 - Push Button Converter - Harley DavidsonFeaturesConvenient way to wire up push-button hand control switchesTakes momentary signal from a push-button hand control switch and...$46.95 -
Thundermax - EA4094 - Center Module - Brake Light - Harley Davidson
ThunderMax
$46.95Thundermax - EA4094 - Center Module - Brake Light - Harley DavidsonFeaturesAllows installation of a center brake light on choppers and custom bikes when used with Thunder Heart’s Micro Harness...$46.95 -
Thundermax - EA4260 - Micro Harness Controller - Fits choppers and custom bikes w/o separate brake light (except 2004-2020 Big Dog w/ proprietary hand controls); choppers and custom bikes w/o separate brake light
ThunderMax
$359.95Thundermax - EA4260 - Micro Harness ControllerFeaturesPerforms all fuse, relay (includes starter relay) and signal-canceling functions in one simple packageProvides multiple flasher combinations...$359.95 -
Thundermax - 309-324 - Pigtail ECM Harness
ThunderMax
$20.95Thundermax - 309-324 - Pigtail ECM Harness Features Handy for motorcycle models with tight clearances around the ECM such as Dyna, Softail Rocker and '02-'05 V-Rod models Allows a second port...$20.95 -
Thundermax - 309-355 - Replacement Oxygen Sensor
ThunderMax
$129.95Thundermax - 309-355 - Replacement Oxygen SensorFeaturesEasy installation: replace the factory ECM, install new O² sensors and harness, load the correct map for your bike, and rideReplacement oxygen...$129.95 -
Out of stock
Thundermax - 309-424 - Pigtail USB Harness
ThunderMax
$20.95Thundermax - 309-424 - Pigtail USB Harness Features Handy for motorcycle models with tight clearances around the ECM such as Dyna, Softail Rocker and '02-'05 V-Rod models Allows a second port...$20.95 -
Thundermax - 309-362 - ThunderMax Engine Control Module Kit with Integral Auto Tune - Touring/Trike/Throttle-by-Wire
ThunderMax
$1,088.95Thundermax - 309-362 - ThunderMax Engine Control Module Kit with Integral Auto Tune - Touring/Trike/Throttle-by-WireFeaturesIncludes ThunderMax ECM with Auto-Tune Module, plug-in harness and two...$1,088.95 -
Thundermax - EA7000 - Oil Cooler Fan - M8 Touring/Trike
ThunderMax
$262.95Thundermax - EA7000 - Oil Cooler Fan - M8 Touring/TrikeFeaturesUses engine temp and vehicle speed to reduce heat and keep engines running coolTakes only 15 minutes to install; does not require oil...$262.95 -
Out of stock
ThunderMax - Stand-Alone Ignition System for Carbureted fits '01-'06 Twin Cam Models
ThunderMax
$365.95ThunderMax - Stand-Alone Ignition System for Carbureted fits '01-'06 Twin Cam Models The ThunderMax Stand-Alone Ignition System for Carbureted '01-'06 Twin Cam Models is a comprehensive system...$365.95 -
Thundermax - Electronically Commutated Motor W/ Auto Tune fits '21 & Up Touring Models
ThunderMax
MSRP: $1,115.95$1,088.95Thundermax - Electronically Commutated Motor W/ Auto Tune fits '21 & Up Touring Models Thundermax is THE name to know if you own an EFI-equipped Harley-Davidson motorcycle. Their standalone...MSRP: $1,115.95$1,088.95 -
Thundermax - Electronically Commutated Motor W/ Auto Tune fits '21 & Up Softail Models
ThunderMax
MSRP: $1,170.95$1,088.95Thundermax - Electronically Commutated Motor W/ Auto Tune fits '21 & Up Softail Models Thundermax is THE name to know if you own an EFI-equipped Harley-Davidson motorcycle. Their standalone...MSRP: $1,170.95$1,088.95 -
Thundermax - Performance ECM's with Integral Autotune System (see desc. for fitment) - Fits 2017-2020 FLHT/FLHR/FLHX/FLTR
ThunderMax
$1,088.95Thundermax Performance ECM's with Integral Autotune System (See desc. for fitment) Thundermax is everything you've been looking for for your motorcycle. This is a software, firmware, and an...$1,088.95
ThunderMax Engine Management Systems – Motorcycle Auto-Tune ECMs, Ignition Modules & Fuel Controllers
ThunderMax is a performance-focused brand specializing in motorcycle engine control modules (ECM) and auto-tune fuel management systems for Harley-Davidson motorcycles. It is strongly associated with high-search keywords such as Harley Davidson ECU tuner, motorcycle performance ECM, fuel injection tuning module and auto tune Harley system, making it a top choice for riders seeking precise engine optimization and improved riding performance.
The product range includes ThunderMax ECM kits with Integral Auto-Tune, oxygen sensor systems, electronic harness controllers and ignition and signal modules. These systems continuously monitor and adjust air-fuel ratios in real time, improving throttle response, fuel efficiency and overall engine smoothness. They are widely used in Touring, Trike, Softail and Twin Cam platforms for both stock and performance builds.
ThunderMax is widely recognized in the Harley aftermarket tuning space for delivering reliable plug-and-play ECU solutions. It targets strong SEO intent keywords such as Harley performance tuner module, motorcycle fuel control system, ECM upgrade Harley Davidson and auto tuning ECU kit, making it a preferred solution for professional tuners and enthusiasts who want consistent power delivery and optimized engine behavior.