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I don't expect the V-braces or extra convertible bracing at ALL. This chassis was engineered from the beginning to handle huge power...that was also its biggest disadvantage when looking at the lower-power models, because they had to carry around that literally 'heavy' engineering. The coupe doesn't need a single piece of bracing anywhere to handle this power. I admit, the strut-tower brace eludes me...and I wonder if that may be more for show than go, but the added rigidity will help aid in suspension calibration.
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I know the chassis can handle alot of power, but can it handle excessive g forces? GM said that they were doing it right, not adding additional structural support will gumby the chassis. If GM wants to forget the handling part and just go for straightline performance then take out the MRC. MRC alone will not wring out the g's, it will stabilize the ride during bumps. Chassis flex induces body roll, look what the X brace on the back seat of the Laguna Seca does, Most of the GT's chassis work came from the GT500 such as the front underbody brace it wears now. No braces would be bad.
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Rotors should be a tad lighter based on my research, not heavier...but looking back, 3lbs less per rotor probably not realistic.
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The old 2009 CTS-V's 14.6 inch setup was one pound lighter than the SS's 14 inch disc. The '09 OEM CTS-V's rotor weighed 25lbs but the massive 6 pot calipers were said to be 2lbs heavier. So you are literally looking at a 2lb gain and then some.