I just pulled them both off the car this past weekend. They are in very good condition. With the stock crank pulley and this pulley I was pegging the gauge at 15+ PSI of boost. I do not know for sure how many miles were on the supercharger or pulley, but you can see the pulley is in great shape. I bought the car used and when I first got it, I had it checked out by Revolution Auto in Baltimore, Md. They have a very good reputation and their mane tuner Adam is one of the best in the industry. They told me this supercharger had way less miles than the rest of the car. The guy who owned it before me definitely drag raced the car and I am certain it wasn't on the stock M122. There was definite evidence of the car having lifted the front wheels off the ground. It had a bent right front strut and the panhard bar was bent too. That ain't happening on that supercharger. Sorry about the orientation of the pics, I had to resize them in order to upload them and this is how they came out. Supercharger-$600 plus shipping. Pulley-$80 plus shipping.