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M5lp 1010 09 O 2011 Ford Mustang Shelby Gt500 Convertible Performance Pack Springs
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Much like the '11 GT, the engine is only part of the story with the '11. While the convertible gets brought up to par with the coupe, the Performance Pack takes things to another level with springs that are 20.5-percent stiffer in front and 9.5-percent stiffer out back. These coils are also shorter by 11mm and 8mm, respectively. Stiffer sway bars and revised brake backing plates that improve cooling are among the other detail improvements under the car.
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