The OEM fangs are the same for 2009-11 on the standard 370Z. The Nismo 370Z has a different front facia as well as side skirts and rear facia. If the car you saw isn't a Nismo 370Z the other possibility is that the OEM fangs have been modified. A lot of 370Z owners like to black them out or cover them with a bumper cover like the Evo-R cover, which essentially blacks them out.