I looked into this question before I bought my springs a few years back. I didn't want the rear of my car sitting up too high, and I wanted it to ride well. Everyone I asked at the time said the 5 leafs were too stiff and sat up too high. Oddly enough they were cheaper than 4 leafs. I don't know why. I bought factory spec 4 leafs from a local suspension shop and I am pleased with the results.
