I'm thinking of putting some aftermarket springs on my 90 535i. My plan is to put springs and different wheels with lower profile tires. But I want a set of springs that are as close to the stock ride as possible. I also want springs with the least amount of lowering possible. Somthing like 1 inch in the front and 3/4 inch in the back.

Also, I've heard some aftermarket springs tend to sag or drop even more after time. I want somthing that will stay about the same (ride and height) over time.

Any suggestions?