I have used these springs for three months on and off. I would put them on the car and then a month later I would put the oems back on. Then I would put the H&R's back on for a month and then put the oem's back on. I have finally had it because the wife and toddler keep complaining when the H&R's are on. I love the springs. I think they are well made and look awesome. BUT the bossman speaks. b