Just got back from SJ after a day at ZCG. Everyone there was friendly and very knowledgeable. Rob was very accommodating and let me spend the entire day there as I had no ride back and forth. He even took me to pick up my brother from SJ airport this afternoon!
Anyway, my 04 G35c did pretty well on the dyno after the tune. My modifications are:
Stillen intake + Z tube
MD 5/16 spacer
I highly recommend Rob and ZCG for your tuning needs if you are located anywhere near the bay area.
Check my graph out down below.