If he can find one, your friend should buy a type r, espicially if he can only pick one up for a few thousand more than his Si. That car is the one every nipper tries to be, and its a collectors item, so it wont loose much (if any) value over the next little while. I wouldn't worry about boosing too much. There are plenty of Naturally Asperated options to give you similar power to what a bolt on kit would give you.