SupraTT6s

Hello everyone! Currently, I've got a S6 and did research on adding some power which led to dead end after dead end. I then looked into a RS6 motor swap and that hasn't been done yet either. Then I saw a post of an imported RS6 and saw it was possible, or at least once. More research I found a topic in these forums about people talking someone who has imported a few, I think a specialized dealer. Most of the topics I read were dated back in 2008-2012 which is pretty dated if we're talking legalities and new regulations. Does anyone know or heard of how this can be done? Worst comes to worst.... I'll just swap the engines.