ThunderMax
ThunderMax AutoTune ECM 309-606 — 2025-Up Gen 2 M8 Softail
ThunderMax AutoTune ECM 309-606 — 2025-Up Gen 2 M8 Softail
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Catalog coverage is incomplete. A missing match does not mean a part will not fit. Confirm fitment for modified bikes with our shop.
Need fitment help?Standalone ThunderMax ECM with wide-band AutoTune for compatible 2025 and later Gen 2 Milwaukee-Eight Softail models.
For a Trask turbo build, confirm your exact motorcycle and load the correct Trask turbo calibration. ECM sold separately from the turbo kit. Earlier Softails use a different ThunderMax application.
Uses 18 mm oxygen sensors; verify exhaust ports. Race-ready applications only. Cannot ship to California.
Manufacturer part: 309-606. Supplier part: 1020-4290.
