Harley-Davidson Softail Slim Tuning
1 supported Harley-Davidson Softail Slim application, 2021.
Harley-Davidson
1 supported Softail Slim tunes
Harley-Davidson Softail Slim
107 (FLSL)
2021
- Controller
- Engine (ECU)
- Remote tuning
- Remote tuning available
HP TunersBook a tune
All Supported Harley-Davidson Softail Slim Tunes
| Engine | Years | Version | Stock power | Controller | Platform |
|---|---|---|---|---|---|
| 107 (FLSL) | 2021 | ECU | HP Tuners |
Other Harley-Davidson Models
About Harley-Davidson Softail Slim tuning
Rapid Racing supports 1 Harley-Davidson Softail Slim application from 2021 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 Softail Slim applications.
Supported engines: 107 (FLSL).
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.