It's impossible to get it working for demo racers in legal way and nobody here won't tell you the illegal way. Simpliest way would be to buy S2 licence or just to forget the tweak
or you can make your own, these guys here think they're so cool cuz they have S2, even tho its recommended that you get S2, theres still things missing like turbo add on and the speed of it.. theres tweak programs out there that can be used by demo racers
If you don't mind, I would really like a link too. Isn't it better to post something like that publicly, and not just as a PM?? Seriously, I think there are a lot of people looking for those tweaks that are never available..