I'd love it if the 370Z were lighter, but you can't have everything. A lighter factory 370Z with our current engine specs and level of daily-driver comfort wouldn't be possible without a significant price bump to use more exotic materials and construction techniques. Or you can go the race-car route and just strip out all the daily-driver goodness (like seats and carpets and plastic and windshields ...), like what's going on over in the Forged Performance thread