NGK Platinum spark plugs are the OEM plug for the 2003-2007 Infiniti G35 with the VQ35DE Motor. We strongly recommend these plugs for all daily driven G35's because of their excellent spark and long lasting(60K).
For those G35's running mildly boosted superchargers or turbo's we recommend going with the cooler PLFR6A-11 plugs.
Nissan Part# 22401-5M015 or PLFR5A-11 = Standard
Nissan Part# 22401-5M016 or PLFR6A-11 = 1 Step Colder
For G35's running built motors with turbos or superchargers we recommend getting the Iridium plugs