The Bose audio parts are lightweight. The kicker is only 10 pounds.
Most weight to be lost easily is the donut (spare). Any other weight will come from stripping the interior or if you really want, completely changing the chassis platform.
Considering the vast majority of weight also comes from the driver him/herself, there's quite a few things you can do to cut weight, although I would think that at most, you'd have to change the panels (aluminum to carbon fiber / fiberglass), get different wheels (yeah, magnesium wheels, 2k a piece, flammable lolol), strip creature comforts and paneling, etc.
The 370Z is lightER as compared to similar vehicles. Cars like the S2000 or RX8 (which you can't even consider really, since it has a tiny 1.8L (?) rotary versus the S2000's 3.0L (?) or the 370Z's massive 3.7L V6) are just not in the same class. You're better off comparing the 370Z to something like the BMW Z4 (which I think the newest iteration is absolutely sexy), Chevy Camaro, Ford Mustang, etc.
No matter how much you compare weight, it's performance you want to look out for. An extremely light car does not mean performance at all. I'm pretty sure a go-kart that weighed 1000 pounds with an engine like the V6 our Z has probably can't get to 45 mph without flying off the road.
EDIT:
An S2000 lightly modded could easy pose a serious challenge to a 370Z. They're extremely light, produce a lot of power for a good power / weight ratio, small wheelbase, and easily modded. I personally think they look fine, although they are scary to be in ... loud too. I'm not here to make challenge to our Z (one of which I own...), but you have to realize that being a fanboy is only going to get you a disapproving look, not any serious consideration.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
Last edited by 370Z Purist; 07-24-2009 at 03:40 AM.
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