Anyone seen a 911 since the 964 body come in IROC Signal Green? Last factory painted car i've seen in that color was the 964c2/c4.

 

The color is chrome shadow and is used on M-Concept vehicles. Here it is on the E60 M5 Concept



and the M3 concept.



Plenty of info can be found from a quick search on M5board, which is where I found these shots. From a quick search, the general idea from m5board is that chrome shadow is highly desired yet not available even as an Individual option.

 

Except Gulf Blue...