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There are two 030 suspensions. There is "US 030" which is what you could get from the factory for a US-bound car. The package includes stiffer anti-roll bars, stiffer (But not lower) springs, and different damper valving from standard cars. No change in ride height. There were minor changes in this suspension from year and between 986 and 986S cars. This US 030 suspension was standard on the 2004 550 Spyder edition.
The RoW (Rest of World) 030 suspension has the same anti-roll bars and same damper valving as the US 030 suspension. However the springs are different and lower the car slightly front and rear and the damper shafts are shorter to accomodate the shorter springs. In terms of stiffness, I have driven cars with both suspensions, and to my butt-dyno the RoW 030 is actually slightly more compliant than the US 030 - but it gives the car a much better stance.
Hope this helps.
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