Interesting review here of the Porsche Cayman with PDK.
The 2009 Cayman derives its power from a horizontally opposed 6-cylinder engine that puts out 265-hp at 7,200 rpm and attains a maximum of 221 lb-ft of torque from 4,400-6,000 rpm. When mated to the standard 7-speed manual these numbers equate to 0-60 mph in 5.5 seconds and a top speed of 165 mph. The PDK transmission (a $3,420 option) will drop the 0-60 time to 5.4 seconds, and the Sports Chrono Package (a $960 option) will drop the time to 5.2 seconds. The top test-track speed for a Cayman equipped with PDK is 163 mph.