The Cayman and Boxster share a lot of things with the 911 - now you could argue that this is a shame for the more expensive model but I would see it the other way 'round. Engine (save the RMS issue), tranny and especially the suspension of those cars are superb and very similiar over the whole range. The Cayman with 997S-hardware would still have to be cheaper than the Carrera model which results in lower earnings for the company!