Harley-Davidson Low Rider S&ST Tuning
5 supported Harley-Davidson Low Rider S&ST applications, 2021+.
Harley-Davidson
5 supported Low Rider S&ST tunes
Select Version
All Supported Harley-Davidson Low Rider S&ST Tunes
| Engine | Years | Version | Stock power | Controller | Platform |
|---|---|---|---|---|---|
| 117 | 2022+ | 105 hp | ECU Delphi MT21M | AutoTuner | |
| 117 | 2022+ | 105 hp | ECU Delphi HD3-CAN | AutoTuner | |
| 117 | 2022+ | 105 hp | ECU Delphi HD3-CAN 2020 | AutoTuner | |
| 117 | 2022+ | 105 hp | ECU Delphi HD1-CAN | AutoTuner | |
| 114ci | 2021+ | 86 hp | ECU Delphi MT21M | AutoTuner |
Other Harley-Davidson Models
About Harley-Davidson Low Rider S&ST tuning
Rapid Racing supports 5 Harley-Davidson Low Rider S&ST applications from 2021+ through AutoTuner, with stock outputs up to 105 hp. Every calibration is built for your exact engine, fuel, and modifications, then verified on our Dynojet 424xLC2 in Jenison, MI, serving Grand Rapids and West Michigan.
Supported engines: 114ci, 117.
Supported controllers: Delphi HD1-CAN, Delphi HD3-CAN, Delphi HD3-CAN 2020, Delphi MT21M.
Don't See Your Vehicle?
These lists cover off-the-shelf tuning platforms. We also do standalone ECU installs and custom calibrations, so reach out and we'll tell you what's possible for your build. Compatibility data last updated 2026-09-24.