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I would say with almost 50,000 they are nearing the end of their life, if not at the end all ready. There are many options out there and they are pretty easy to replace yourself. There are a number of posts here on how to if you do a forum search. You might want to go with the C6 Z06 shocks from Gene at Fred Beans(about $200) and the Z06 sways while you are under the car.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.