I have a late 2000 E39 535i 'M' Sport, just replaced the old tired shocks with Bilstien B8's, it appears B6's are no longer listed, it has improved the car noticeably with the progressive action the first thing I felt pulling out of the car park, the downside is it is very firm on the road.
Does anyone have experience of the Bilstein Eibach B12 set up and how that compares to the standard sport feel or any suggestions to improve the quality of ride please?
Cheers, Chris..

 

I've installed B8 w Eibach lowering springs -30/30mm on my 530iA and I regret it... I should have waited for Koni Sport cause they match w Eibach progressive springs much better... Car is kinda soft at first and harsch on bumps... it only performs well on smooth roads or when pushed hard and at higher speeds over 110km/h...
My recomendation is to leave M springs or get others than Eibach, they are not ideal combo w B8 (confirmed by other guys as well)...