To Blakblur, I am on the same quest; i.e., trying to get a Crossfire to breath better. Let me know if you have any luck, and I'll do the same. One other option that you might want to think about is changing out the gears in the rear end. For $1,500 this might be an easier way to get a noticeable increase in performance. To those questioning; "Why go to the trouble to supercharge or turbo a Crossfire?" The answer is that the Crossfire is generally reliable and economical - it just needs a little more air. A little bbost would go a long way. If I wanted to go to all of the trouble to modify the computer, electrical, fuel system, etc., I'd tear the thing out of there and stuff in a big block. But there is a difference between maximum performance and a daily driver.