FWIW, I'm now betting the darn thing is exactly replaceable with a Carrera retractible spoiler/engine lid. You'd have to get the turbo air cleaner flanges for bottom of engine lid, the center brake light slat, probably just plug and play the spoiler/wing actuator.

Seems like it would be a top engineering/design priority for Porsche to interchange as many parts as possible between 997 models.