I'm giving this serious thought in regards to my 1989 GMC Suburban R2500 2WD 5.4L TBI. If this is accurate, I should be able to install a system that would increase power and efficiency by 30-40% without too much trouble.
I'm also planning on converting to LPG/CNG for the main fuel to run it. With the HHO enhancement (assuming it even works) I should be able to do phenomenal things with my +12 Giant SUV of Earth Killing.
No matter how good it gets though, I ain't painting my shit green.