Grim GT Tuning
1 supported Grim GT application, 2020+.
Grim
1 supported GT tunes
All Supported Grim GT Tunes
| Engine | Years | Version | Stock power | Controller | Platform |
|---|---|---|---|---|---|
| 3500 4.5l | 2020+ | 170 hp | ECU Bosch EDC17CV41 | AutoTuner |
Other Grim Models
About Grim GT tuning
Rapid Racing supports 1 Grim GT application from 2020+ through AutoTuner, with stock outputs up to 170 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: 3500 4.5l.
Supported controllers: Bosch EDC17CV41.
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.