Hello everyone I find the ride stiff on the rear end of my car. Has anyone changed the rear springs to a softer spring rate? Does anyone have any suggestions on how to improve the ride quality. Keep in mind that I have a street car and not planning on racing it. I am running 20s with 35 series tires. I have reduced the tire pressure but it still rattles my kidneys when I hit a bump. Any help would be appreciated. Thank you