EFI Tuners

New pipes, a cam or a big-bore kit change what the engine needs, and the factory ECM won’t follow along. These tuners fix that. ThunderMax replaces the ECM entirely and auto-tunes with wideband O2 sensors. Dynojet Power Vision 4 flashes the stock ECM with proven maps and logs data. The Vance & Hines FP4 tunes from your phone. We stock them for Twin Cam, Milwaukee-Eight and Sportster models, plus the O2 sensors, 18mm-to-12mm port bushings and NAMZ extension harnesses you need to install them cleanly.

Showing 1–24 of 34 resultsSorted by popularity

ThunderMax ECM with Integral Auto Tune System for Harley-Davidson
Rated 4.95 out of 5
Sale! Price range: $969.95 through $1,088.9511% OFF
A standalone ECM replacement with integral AutoTune for fuel-injected Harley-Davidson models, continuously refining fuel and timing maps in real time with no dyno visit required.
Dynojet Power Vision 4 for 2006-2013 Harley-Davidson
Rated 4.63 out of 5
Sale! $533.32$479.9910% OFF
Flash-tune your 2006-2013 J1850 Harley-Davidson ECU via Bluetooth using the Power Vision 4 - features Autotune, QuickTune, and cloud-based tune access from your phone.
Vance & Hines FP4 Fuelpak Auto Tuner for Harley-Davidson
Rated 5.00 out of 5
Price range: $399.95 through $505.95
The Vance and Hines FP4 Fuelpak delivers dyno-tuned maps, live sensor data, and full ECU control via smartphone app for select 2007-2024 Harley-Davidson models.
Twisted Choppers O2 Port Bushing Adapters 18mm-12mm Zinc Plated USA Made Sold as Pair
Rated 5.00 out of 5
$13.95
Zinc-plated adapter converts 18mm O2 sensor port bungs to 12mm for modern sensor fitment on any custom build - 18x1.5 male to 12x1.25 female thread, USA-made, sold as a pair.
ThunderMax Wideband O2 Oxygen Sensor for ECU Auto Tune System
Rated 4.83 out of 5
Sale! $129.95$119.958% OFF
USA-made 18mm wideband O2 replacement sensor for ThunderMax ECM and auto tune systems - restores accurate fuel mapping and closed-loop control to your EFI setup.
Dynojet Power Vision 4 for 2011-2020 Harley-Davidson
Rated 5.00 out of 5
Sale! $533.32$479.9910% OFF
Dynojet Power Vision 4 PV4-15-02 for 2011-2020 Harley-Davidson provides Bluetooth ECU flash tuning via the Dynojet app with full return-to-stock capability.
NAMZ O2 Sensor Extension Harness Kit for 2010-2017 Harley-Davidson FL Touring Softail Dyna
Rated 4.00 out of 5
$33.95
Plug-and-play O2 sensor extension kit for 2010-2017 Harley-Davidson FL Touring, Softail, and Dyna enables 2009-style exhaust fitment with 24-inch leads and 18mm-to-12mm bung adapters included.
Dynojet Power Vision 4 for 2021-2024 Harley-Davidson
Rated 4.50 out of 5
Sale! $533.32$479.9910% OFF
Dynojet Power Vision 4 PV4-15-03 for 2021-2024 Harley-Davidson M8 models provides Bluetooth ECU flash tuning via the Dynojet app with full return-to-stock capability.
Dynojet Power Vision EFI Tuner for 2001-2017 Harley-Davidson Delphi J1850 ECU
Sale! $755.54$679.9910% OFF
Flash-tune 2001-2017 Harley-Davidson Delphi J1850 ECU from the road using proven Dynojet maps and live diagnostic monitoring without a laptop or dyno time.
Bikers Choice O2 Sensor Bung Plug 18mm x 1.5 and 12mm x 1.25
Sale! Original price was: $6.95.Current price is: $5.95.14% OFF
Seal unused O2 sensor ports on non-EFI exhaust systems with chrome-plated bung plugs -- available in 18mm x 1.5 or 12mm x 1.25 thread sizes, sold individually.
Dynojet Power Commander 6 for 1997-Up Harley-Davidson
Sale! Price range: $345.99 through $529.9910% OFF
Dynojet Power Commander 6 for Harley-Davidson provides plug-and-play fuel and timing map tuning across Sportster, Dyna, Softail, Touring, V-Rod, and Street platforms.
Dynojet Power Vision EFI Tuner for 2011-2022 Harley-Davidson Delphi CAN ECU
Rated 4.50 out of 5
Sale! $755.54$679.9910% OFF
Flash-tune 2011-2022 Harley-Davidson Delphi CAN ECU from the road using proven Dynojet tunes, built-in autotune, and live diagnostic monitoring without a laptop.
Dynojet Power Vision 4 for 2014-2024 Indian Motorcycle
Rated 4.75 out of 5
Sale! $522.21$469.9910% OFF
Dynojet Power Vision 4 PV4-29-01 for 2014-2024 Indian Motorcycle delivers Bluetooth ECU flash tuning via the Dynojet app with full return-to-stock capability.
Dynojet Target Tune with Wideband O2 Sensors for Harley-Davidson
Rated 5.00 out of 5
Sale! Price range: $635.99 through $649.9910% OFF
Dynojet Target Tune for Harley-Davidson delivers real-time air/fuel ratio correction using two Bosch wideband O2 sensors paired with your Dynojet Power Vision tuner.
Dynojet Power Vision 3 for 2006-2013 Harley-Davidson
Rated 5.00 out of 5
Sale! $533.32$479.9910% OFF
Flash-tune your 2006-2013 Harley-Davidson ECU roadside without a laptop using the Power Vision 3 - includes a full Dynojet tune library and live diagnostics.
Dynojet Power Vision EFI Tuner for 2021+ Harley-Davidson
Rated 5.00 out of 5
Sale! $755.54$679.9910% OFF
Flash-tune 2021+ Harley-Davidson ECU from the road using the Dynojet Power Vision - features built-in autotune and live diagnostic monitoring for newer Milwaukee-Eight models.
ThunderMax USB Pigtail Harness for ECM Auto Tune System
$20.95
USB pigtail extension harness for the ThunderMax ECM Auto Tune System, routing laptop connectivity to tucked or hidden ECM locations on custom Harley-Davidson frames without repeated disassembly.
Dynojet Power Vision 3 EFI Tuner for Indian Scout Thunderstroke 111/116 FTR 1200
Rated 5.00 out of 5
Sale! Original price was: $588.88.Current price is: $529.99.10% OFF
Flash-tune your Indian Scout Thunderstroke 111, Thunderstroke 116, or FTR 1200 ECU roadside without a laptop using the Dynojet Power Vision 3 - made in the USA.
Dynojet Power Vision 3 for 2021-2024 Harley-Davidson
Rated 5.00 out of 5
Sale! $533.32$479.9910% OFF
Flash-tune your 2021-2024 Harley-Davidson ECU roadside without a laptop using the Power Vision 3 - compatible with Sportster, Softail, Touring, and Pan America models.
Vance & Hines FPX Auto Tuner with Trak For Harley-Davidson
$499.95
The Vance and Hines FPX Auto Tuner adds GPS live tracking, crash detection, remote ECM disable, and dyno-tuned maps via smartphone for select Harley-Davidson models.
Dynojet Power Vision 4 Auto Tuning Kit with Target Tune for Harley-Davidson
Sale! Price range: $1,054.95 through $1,067.9515% OFF
Dynojet Power Vision 4 and Target Tune bundle for Harley-Davidson combines Bluetooth ECU flash tuning with real-time closed-loop air/fuel correction in one complete kit.
Dynojet Power Vision 3 for 2011-2021 Harley-Davidson
Sale! $533.32$479.9910% OFF
Flash-tune your 2011-2021 Harley-Davidson CAN bus ECU roadside without a laptop using the Power Vision 3 - includes a full tune library and live diagnostics.
Dynojet Universal Digital Tuning Tokens for Harley-Davidson Power Vision EFI Tuners
Sale! Price range: $9.49 through $279.9515% OFF
Digital token credits for Dynojet Power Vision 3 and Power Vision 4 EFI tuners, unlocking additional flash cycles, ABS bleed functions, and advanced shop capabilities for Harley-Davidson tuning.
Dynojet Power Vision 4 for 2023.5-Up Harley-Davidson
Sale! $577.77$519.9910% OFF
Dynojet Power Vision 4 PV4-15-04 for 2023.5-Up Harley-Davidson Touring delivers Bluetooth ECU flash tuning via the Dynojet app, calibrated for the G26 ECU generation.