You should contact them and contact McKinney Motorsports (they do RB installs, as well as Unstable Hybrids) to see if anyone will have any information for you as far as maybe just purchasing the re-worked ECU. I wouldn't go for it, personally, unless you wanna leave the plug there and tell them that you've been having electrical problems with the car or some bs excuse like that when they can't pull anything up... who knows... it might work.
Edit: West found this link
http://www.925style.com/editor_direct.html in our links section. They have RB info, not sure for which displacement though. You might wanna check it out.