"Speaking of mass, there will also be a convertible version of the GT500, as before. And though, theoretically, any 2013 Shelby should have the muscle to hit 200 mph,
Ford will govern the top speed of the convertible to 155 mph or so, the current Shelby’s speed limit. The heavier convertible has a softer suspension and no rollover hoop. It’s also likely that
the Shelby coupe without the Performance and Track packages may be governed, due to cooling issues—the Track package adds engine-, transmission-, and differential-lubricant coolers. After all, SVT says the Shelby coupe weighs 3850 pounds, and its powertrain generates a lot of heat."
Source:
http://www.caranddriver.com/reviews/...e-a-bmw-page-2
...which BTW doesn't bode well for that super-amazing 'Ring time...HEAT SOAK...