LOL so sad to see another turbo kit question. Its going to be a tough one for those who want to go from NA to turbo. It seems like Cobb AP is not going to provide support for the 2008-2011 NA impreza's. I don't think they are going to bother getting into the NA'd roms.
Looks like its going to be a while before forced induction would be available for our cars. Don't rush into killing your car so quickly with a kit that our cars aren't even really built for.