For the best buying experience: read the whole advert, ask as much as you like, and then buy.
Brand new. Packaging opened for pictures only.
From ThunderMax website:
"ThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-605 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required. At its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride. The ThunderMax 309-605 also features knock correction for timing adjustment, adding another layer of performance by adapting ignition timing on the fl fl y. Unlike other aftermarket tuners, ThunderMax fully supports factory features, so your ride modes, Wi-Fi, and navigation all continue to work seamlessly. This ECM is compatible with both VVT and non-VVT bikes. Notice: ThunderMax ECMs utilises 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included."
Fits 2023.5 Harley-Davidson Touring models (except 2023-Up Road King, 2023-2024 Ultra, and 2023-Up Trikes - see part number 309-591) Message us with VIN number beforehand and we will double check fitment. Sales will not be processed without VIN check.
PN 309-605
RRP £1346
Important Information:
Please review all photos carefully as they form part of the description; only items pictured are included. Stock images, if used, are for reference only. To save time and avoid frustration, please message us to verify compatibility before purchase. Note: All parts are security marked to prevent fraud.