En USA ya estan probando y por lo visto buenas noticias: copio/pego.
I just finished installing highland springs and dampers to my ’22 M3 LR. It has been over a month since I test drove a highland so my memory might not be accurate, but the improvementfrom stock is huge. Swallows larger bumps much better and does not have any jerkiness over smaller imperfections. It still has suspension ‘sound’ eg when there is a bump you can still hear suspension ‘thumps’ when it rebounds. This might improve over next weeks as the car is noticeably higher than before, new springs need to settle. I would say this upgrade gives 90% of the highland suspension.
I previously tried KONI Active frequency dampers with original springs. I would say it was mostly as harsh as original. There might have been a defect in the front KONI dampers, in 2000-3000km they developed a clunk and I retorqued everything with no improvement. Switched back to original dampers and clunk was gone.
Part numbers for highland suspension:
1344362-00-D Front Left Spring and Damper assembly (185€)
1344362-01-D Front Right Spring and Damper assembly (185€)
1344462-00-D Rear Damper (140€/piece)
1344472-00-B Rear Spring (120€(piece)