have looked at kbb, edmunds, the porsche site.

l would call up a Porsche dealer, although they probably wo not know off the top of their heads, they will have access to factory manuals etc. By the way, what do you need the info for?

i'm sorry, l do not know how to show this to u but i'm a porsche tech & have access to internal resources. the answer to interior dimensions r 260 liters or 9.2 ft. cu. in the rear luggage area & 150 liters or 5.3 ft. cu. in the front yeilding a total storage or luggage area of 410 liters or 14.5 ft. cu. there r also various storage compartments, two in the rear luggage area & a glove compartment & storage envelopes on each door. The interior space (entire occupant area) l could not find.

Use a tape measure to measure yours.

also try looking at cayman reviews in porsche mags.

Luggage volume (max) - 14.5 cu.ft.
Passenger volume - 48 cu.ft....

Manual Tiptronic S
Body Length: <172.1 in> <172.1 in>
Width (without mirrors): <70.9 in> <70.9 in>
Height: <51.4 in> <51.4 in>
Wheelbase: <95.1 in> <95.1 in>
Drag coefficient: (Cd) <0.29> <0.30>
Curb weight: <2,866 lbs ><2,998 lbs>
Cargo Area Volume :
Fuel Tank Capacity: <16.9 gal.> <16.9 gal>
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i do not know if it was enough but l hope u get ur answer.