Hi @hondasport, sorry for the late reply. I can't really recommend the h&r's. They cost me a 1000€ and 2 shock absorbers broke after just 2 years / 20,000km. I got new ones through their warranty program but was quite a hassle. And again last december, one of the shocks i replaced broke again. That's when i replaced the whole set with BC racings which are a million times better. The ride with the h&r's is pretty good, a bit too soft for track though. The height adjustment works well, as long as you remember to keep the rings greased to make sure they won't get stuck. But you adjust the height by compressing/decompressing the spring, compared to adjusting the height of the shock like with BC & MeisterR for example which is a lot better. And there's not damping adjustment on the h&r's either. I reckon you need TÜV-certification, that's why you're considering h&r?