http://www.musclemustangfastfords.co.../0411mm_super/

FTA : "I'll tell you right off the bat that we've yet to find one single "best" supercharger. This may disappoint those looking for a clear-cut winner, but the bottom line is that most blowers work well, both in theory and practice, and all have good points and bad. And, while there are ways to directly compare blowers, it's more important to understand how they work and what to expect from each one. Different vehicles may benefit from one type or another so it's important to know what you're looking for."