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Originally Posted by blue2000s
^^I'm not sure why that would happen.
The M030 suspension is the factory sport version of the suspension. It's a code used on many Porsche models, even though the parts are different. I think what the OP is actually asking about is the RoW M030 suspension, which is lower by 20mm in front and 10mm in back than the US suspension. There are M030 versions for both regions.
If you just replace springs and not struts, there are two issues that I can think of and both are minor:
1. The struts are slightly longer than they need to be and the potential for bottoming the strut is greater. Bottoming a strut can damage it. I don't think this is a big risk considering it's a very minor drop with a corresponding increase in rate. Also the bump stops are still in place to protect from bottoming and are actually the same part between the RoW and US suspensions.
2. The damping of the stock struts, especially worn stock struts would not be sufficient for the increased string rate. Leading to some bouncing. Again, the spring rate difference, while noticeable, probably isn't enough to underdamp the suspension.
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I've seen several cases, wherein aftermarket springs (ones that were significantly stiffer than the oem's) , took their toll on the oem shocks over time . And, subsequently caused suspension "droop" if not shock failure . I'm not saying that this is always the case, however, it's something that can certainly occur . Now, whether or not the difference in spring rate between the M030 and oem's is significant enough the cause this issue is out of my depth .