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Other than they are 17 years old? If you had car that age, regardless of the miles, a tune up would involve new plugs, wires, belts and hoses.
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Just my opinion but since you asked the question I am guessing that you expect something or know in your own mind that it is a good idea. If for no other reason than peace of mind I'd do it. Then go on a nice test ride!
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After this long, the \\;age has probably increased the resistance in the copper. \\; I'd definitely go with a new set, whether stock or aftermarket. \\; For what it will cost you, the peace of mind alone would be worth it.
Assuming they are the original wires, I would expect that you would get a small increase in performance (very small). Wires that old are in need of replacing.
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