Harley-Davidson Fat Boy Tuning
1 supported Harley-Davidson Fat Boy application, 2021-2024.
Harley-Davidson
1 supported Fat Boy tunes
Harley-Davidson Fat Boy
114 (FLFBS)
2021-2024
- Controller
- Engine (ECU)
- Remote tuning
- Remote tuning available
HP TunersBook a tune
All Supported Harley-Davidson Fat Boy Tunes
| Engine | Years | Version | Stock power | Controller | Platform |
|---|---|---|---|---|---|
| 114 (FLFBS) | 2021-2024 | ECU | HP Tuners |
Other Harley-Davidson Models
About Harley-Davidson Fat Boy tuning
Rapid Racing supports 1 Harley-Davidson Fat Boy application from 2021-2024 through HP Tuners. 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. Remote tuning is available for supported Harley-Davidson Fat Boy applications.
Supported engines: 114 (FLFBS).
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.