This year I've bought a set of M030 springs for my boxster (it was on base springs) and I didn't find them expensive from the Porsche dealer. About the same price as a set of Eibach springs.
As far as I was able to trace back, the M030 sport springs will make it sit about 1cm lower than the base springs. That's fine for me and a lot better than the 3cm given by Eibach, H&R and the like.
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