I have the tokicos and h&r SS springs. I have it set to 5 on all 4 corners. Because of the drop I ended up with, the x brace under my K-member srcapes everything because there is like barely and inch of ground clearance left. On the bayarea freeways you don't want your mustang dippin' because you're likely to rip out the k-member on the asphault that sometimes stick up. I.E highway 680 north in pleasanton area. if you hit a dip with 5 setup on all corners you will fair better. I actually liked the 3F and 4R because it gave such a nice ride, but I had to change it. now I'm left looking for more clearance without changing springs. Maybe 18" wheels.