This was posted on the Boxster board recently. It's quite interesting. The thing that caught my eye in particular was the 2.7 results. 195hp at the wheels from 217hp at the crank. 10% loss??? Sorta sounds like buying an S isn't quite an improvement over the base Boxster as Porsche would like people to think.

http://www.babblers.org/events/2-17-2001.htm