I have two sets of aftermarket SMIC's for sale, HKS's, and GReddy's. The HKS's are off my personal car, with ~10k on them, in great shape with the typical wear from bugs, etc. As you can see they don't have any oil residue in them and are clean as new inside. The GReddy's are like new, and are off a customer's car. From the looks I would say less than 5k miles on them.