I purchased a set of 4 for my 06 Dodge Magnum R/T. Along with many of the suspension upgrades I did, I bought these for the versatility and price. My ride is now firm, no more wheel hop or sag in the rear over bumps or changes in road elevations, and I have the option to add lowering springs if I choose at a later date. I've only had them for a few weeks now, but they have a lifetime guarantee if anything changes. The customer service was exceptional, and delivery was perfect.