I have a 2005 G35 with Vortech S/C. I was told it has 550CC injectors. I am trying to determine if this is in fact true (due to the AFR leaning out above 5,900RPM as if someone just shut off the injectors --->17:1AFR).

Of course I let off, and haven't hit that under WOT since until I can resolve the issue. I assumed the injectors were Deatschwerks because they used to sell 550CC size. However, the injectors appear identical to similar one's that came from the factory (Black with an orange ring).

Any thoughts?

 

Remove them and have them flow tested. Only way to know for sure.