I bought two pairs of these to run my custom 2012 Nissan Altima which I've read is sagging. I installed them today, took about an hour both sides, it was pretty easy as if it should take. Now the back of my car doesn't sit low to the ground. I added about 2 inches in the back so I can sit as high as the front. The rear used to be against the wheel arch, now it seems normal.