I installed the back Sumosprings in less than an hour. The difference in the ride was night and day. The first thing my wife and I noticed was the 50% reduction in noise. We drove up into the mountains and we were able to take the corners 5 to 10 miles an hour faster. The side to side shifting was seriously reduced coming out of driveways. Front sumospringS are installed now. Can’t wait to test it.