Quote:
Originally Posted by tock172
B6's aren't designed for lowering springs. For anyone wanting to run Bilstein dampers with factory M Sport, BMW Performance, Eibach lowering springs or anything lower, you want to run the B8 Performance Plus which was built to cope with less travel.
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You might note that Turner, the OP's vendor, doesn't recommend using the B8s with the M-Sport Springs. I really hate this kind of advice when it isn't accompanied by a reason. Incidentally, looking at the pictures of the OP's car, his ride height seems pretty close to stock. I'd bet the so-called BMW Performance Springs are just the M-Sport Springs.
I have a Mercedes with the Mercedes Sport-Package. The Sports-Pkg lowers the car about 0.5" from the stock ride height. I checked with Bilstein what was the correct strut for it. They said the B8 was correct.
At the same time, I examined the specs for the B6 and B8 and noted the body of the B8 was slightly shorter than the B6. What people might not realize is a car can be lowered by a shorter strut and/or shorter spring. Also if I had installed the B6 in my car instead of the B8, the installation would have raised the height of my car.
In any case, I would put the B8s on my M-Sport Pkg and use the M-Sport Springs. As a check, I'd measure the strut length of both the stock and B8 to check they were essentially the same.
