GMC Topkick Tuning
2 supported GMC Topkick applications, 2001-2009.
GMC
2 supported Topkick tunes
Select Version
All Supported GMC Topkick Tunes
| Engine | Years | Version | Stock power | Controller | Platform |
|---|---|---|---|---|---|
| 8.1 | 2006-2009 | ECU | HP Tuners | ||
| 6.6 | 2001-2008 | ECU | HP Tuners |
Other GMC Models
About GMC Topkick tuning
Rapid Racing supports 2 GMC Topkick applications from 2001-2009 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.
Supported engines: 6.6, 8.1.
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.