well, as far I know there was just a little improvement for new 2003'er Boxster modells. The M03 is very good, track tests with far lowered aftermarked suspensions showed that there is no significant advantage for aftermarked products. There's more the danger that U don't get such a fine for the boxster adjusted suspension then the M03.
Track freaks swear on M03 combined with Wendland springs. These are modified h&r springs. But they are no more delivered so far. The combination of std. suspension with h&r springs results in hight comfort. Some say due the progressive springs the suspension respongs more sensible then the std. suspension.
good luck for your choice
frank
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