Check this out: "All that shrinkage helps this Z shed a few pounds. A base-model 370Z with a manual transmission weighs in at 3,232 pounds. That's 88 pounds less than a base-model 2008 Nissan 350Z with a manual transmission.
Even the heaviest 370Z still weighs just 3,314 pounds."
link:
2009 Nissan 370Z - 2008 Los Angeles Auto Show