Here's a pretty interesting site I found that lists all kinds of performance figures. For the G35 it doesn't specify what model, but it has some numbers there. You can also do comparisons between cars so you can get an idea of who can smoke you and who you can smoke. Pretty cool.
http://www.car-videos.com/performance/index.asp
'03 AT Sedan | Brilliant Silver | Willow Leather | Sport | Premium | Aerokit w/Spoiler | Nav
http://www.car-videos.com/performance/index.asp
'03 AT Sedan | Brilliant Silver | Willow Leather | Sport | Premium | Aerokit w/Spoiler | Nav