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Towards the end, the WS6 package was a marketing gimmick to make you fork up $3500 for a cool hood and wheels. They didn't change the suspension very much on the 2000-2002 cars from non-WS6 cars.
Don't forget the 04-05 Grand Prix CompG package was also designated WS6. It actually had more goodies than the TA package...including higher (numerically) gearing.