Originally Posted by subieworx
Don't lower the rear end too much with those spring rates. I am running 450/900 on my AST's with the rear tire just about even with the rear fender and it is too low as it hits the bump stops on larger bumps and can unsettle the car. Not sure why AST hasn't done shorter shock bodies in the rear and can't talk them into doing it.
Most experienced suspension tuners know the limited compression travel on these late model BMW's and be cautious when lowering these cars. It's mostly the DIY guys that slammed their cars are having issues.
Tire to fender clearance is poor indication of ride height since not everyone is on the same brand and model tire and of the same overall diameter.