Perhaps m4a1mustang is going by the GVWR tag on the driver's door. On my '11, it states that the maximum passenger + cargo load is 432 lbs.
So, 600lbs in the trunk + driver + fuel = a seriously overloaded Z, according to Nissan. No doubt that much weight helps traction. I offer no opinion as to how that affects one's car, but you are almost doubling the "official" capacity with a ~780lb load of concrete and driver.
Last edited by Augustus; 12-27-2012 at 11:41 AM.
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