reginos:

Now the 3.4 Carrera costs 60% more than the 3.4 Boxster S. 

not true in the UK.

list Boxster S: around £46k

list C2: around £71k

But C2 in the UK has full leather interior, PCM and climate control, all of which are options on the 981S. These options add around £4k, taking 981 cost to £50k, like for like. As a result, 991 costs about 40% more than 981S.