EM did not allow rollers. I think that has chagned for this year. I think the biggest bonus with using the Indys was the fact that he could make a better shape by reducing the port easier than building it up. I'm also fairly certain that the Dominator adaptor was a way around the rules, but which rule in particular Im not sure. He modified it but for soem reason my PC wont let me go to the article again and try to figure out why...