The horsepower race has gone nuclear: 2013 GT500

Lug

the 370 originally dropped about 200 lbs from the 350 via aluminum parts, shortened chassis, etc. They said 100 lbs got added back due to new safety requirments so it's a bit of both.

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keep Chubbs in your pocket - Chubbs

ImportConvert

Is that what they said? I could not find that. I found only that larger brakes, and more bracing added the weight back. You can call that safety equipment if you choose, as it's just semantics, but to me, anything that substantially increases torsional and bending rigidity functions first as a performance modification and second as a safety function, simply because a car that is TOO stiff will be more dangerous. The C6 Corvette actually had to be given some failure zones because it was initially too stuff and the force of some collisions transferred without much damping to the occupant. SO to me, that extra weight is pure performance, in the 370Z, regarding the bracing. Of course you can argue extra air-bags weight a bit, but not 120#.