Check out Kleemans web page as they put on superchargers on SLKs and now they will put them on Crossfires. Cost $9,500 plus $1,200 for installation. No engine mods to get 330hp. I have a e-mail I recieved from Kleemans about my Xfire so if you e-mail me, I will forward it on to you with all the details. With the chip, they also supply, they say it's 350hp. I don't know a lot about superchargers so how good it is, I don't know. EXFYRED sent me an e-mail about the Kleemans and the Vortech superchargers. I can forward his response too if you like. Maybe we can get EXFYRED to post a bit of information up for all of us. He seems to know a lot about superchargers, boast etc. EXFYRED! You there?