Hummer H3 Tuning
4 supported Hummer H3 applications, 2005+.
Hummer
4 supported H3 tunes
Select Version
All Supported Hummer H3 Tunes
Other Hummer Models
About Hummer H3 tuning
Rapid Racing supports 4 Hummer H3 applications from 2005+ through AutoTuner and HP Tuners, with stock outputs up to 305 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. Remote tuning is available for supported Hummer H3 applications.
Supported engines: 3.5, 3.7, 3.7i, 5.3L, Alpha 5.3.
Supported controllers: Delco E67.
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.