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If PASM is $650 cheaper and comes with all the factory warranty stuff, why would you not order it when ordering a 997?
For whom is the PSS-9 system worth the extra? What kind of driver?
A driver that wants full (manual) control and adjustability over the handling of his car. Until someone comes out with a modification designed to work with it I believe you are better off leaving it alone. "Skip from Boulder" has put quite a bit of time on the track with his 997S with PASM and has extolled it's virtues (which surprised him).