on what year car? I ran BBK Specific Rate springs on my '92 GT. If I remember correctly they were to lower the front 1.5" and rear 1.25". the stance was beautiful and I really don't think the ride suffered much at all. The only thing I really did notice is on dips, ya really can feel the body camber/flex without subframe connectors . . . It's a really "interesting" feeling. If ya now anyone who gets motion sickness really easy, don't let them ride in your car. Don't forget CC plates and new shocks/struts. I used KYB, they are much cheaper than KONI, and I thought they worked well.