Anyone have thoughts about replacing the stock ECM with one of these? Looks like this stuff all been out a while and most that aren’t bone stock have it. And seems the most cost effective way to unlock the engine.

https://predatorinc.com/shop/alpha-raptorq-ecm/

 

No personal experience. There have been debates on various Hummer forums on whether the claims are documented and true and whether the performance claims are valid. You might search on this and other forums and read the threads for yourself.