Todd,
Bill Hall here, armed with a little knowledge....and dangerous

. I had looked up the order type code for the Cabriolet and was literally almost out the door on my way to my dealer for a try when Thumper emailed me with your information. (As it turned out, the technician who has been helping me is on vacation until Wednesday.)
But, I've since been wondering, what unintended effects might be encountered if the order type is changed in the DME of a car that is still, after all is said and done, a Boxster? Your car, with the Carerra engine, thinks of itself a Carrera in a Boxster's body. Standby......
I just read:
http://www.renntech.org/forums/index.php?showtopic=14234&hl=dme
It appears that my MY03 Boxster's ME 7.8 DME is compatible with Boxsters and Carreras. So, by mapping the DME (or, remapping the instrument cluster portion) nothing will be changed to preclude the car from operating as it did before the procedure. Is this correct?
Cheers,
Bill