Quote:
Originally Posted by cypis007
Here is what Bilstein on-line catalog says:
BILSTEIN - B6 Adjustable 10
Gas Pressure, for vehicles with standard chassis
BILSTEIN - B6 SPORT
Gas Pressure, for vehicles with standard chassis
BILSTEIN - B8 SPRINT
Gas Pressure, for vehicles with M-technology
BILSTEIN - B4 Gas (Ersatzteil)
Gas Pressure, for vehicles with standard chassis
BILSTEIN - B4 Gas (Ersatzteil)
Gas Pressure, for vehicles with sports suspension
Based on this there is no B6 for sport suspension.
M-technology springs are lowering very similarly to typical Eibach (eg. ProKit) or H&R - I guess it is -25mm and -35mm respectively - so shorter shock B8 will work better with it, than stock length B6 or B4.
I followed this classification and for my car with option S704A (M Sports suspension), I picked B8 and I am more than happy.
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I believe M technology in this case is the BMW performance suspension package that is lowered from the m-sport/sport suspension, yes definitely B8 for those yellow springs. I have had Bilstein themselves and several Bilstein reps in the US tell me that the B6 is for both std and Msport/sport suspension and B8 is for after market lowered springs. It probably isn't a case of they won't work, just what Bilstein recommends. I could see using the B8 on sport suspension would alleviate some of the complaints of a 1/2" ride height increase due to the gas pressure on new B6 installs.