ThunderMax for 95 - 98 Magnetti Marelli® Models

Part Number: 309-312 The ThunderMax 309-312 and 309-313 ECMs are designed exclusively for Magnetti Marelli–equipped EFI Harley-Davidson® models. These units will not function on bikes that have been converted to Delphi EFI. If your motorcycle has been converted to Delphi, you will need ThunderMax part number 309-314, available through Zipper’s Performance. ThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. The 309-312 is designed specifically for Magnetti Marelli–equipped EFI models from 1995–1998, bringing modern tuning control and reliability to these early-generation EFI bikes. The kit 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. This kit also includes a speed harness, tip sensor, and harness, ensuring proper integration with the Magnetti Marelli sys