I found this interesting ...
" 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. "
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