I've got the Gemballa springs on my '00 Boxster S. There's no way they lower the car only 10 mm, my drop was a lot more than that. I've also heard they're the same as the H&R springs, which are like a 1.5" drop. Personally, I think they look great. I paid $150 for mine, new, but I got lucky, real lucky. I think you can expect to pay between $300 and $500, but I wouldn't pay more than what you can get the H&R springs for. Gemballa is not in the business of making springs, so they're definitely made by someone else. It's very probable that they could be made by H&R.
Performance is fine. I haven't noticed any additional harshness in the ride once I installed the springs. I think this is the best mod I've done for my car.
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