Intermediate shaft failure...
Well, this morning on the way to work I was a stoplight and all of a sudden it sounded like a bunch of rocks were tumbling through the engine and the car shut down. It would not restart and I pushed over to side of the road into a parking lot. Porsche roadside service picked it up and took it to the local dealer. They won't be able to get a good look until tomorrow, but the initial thought from my dealer is an intermediate shaft failure. He said this would mean a new engine at no cost to me. By the way, it's a '05 C2S with 18,000 mi. I'm kinda bummed. Also, there are no engine/mechanical mods.