If Boxster S will be with 3.4l Cayman S engine in near(or far) future-price will go up as well... Probably at Cayman S level. Now, how much sense does it make to have Boxster S and Cayman S with same engine and for the same money?? This leveling will probably kill Cayman S sale...
How about something else-power kit X51 for Cayman S! This 3.4l engine has potential up to 330hp so, something is 320hp area is possible(knowing Porsche it will be for 10000 Euro or more)...