Ok i know its kinda bias but after reading jr's web site they said,

"Unlike a turbocharger, the Eaton supercharger does not contribute to under hood heat (which is where you pick up your intake air). Our system only increases the intake charge air by 74 degrees Fahrenheit even when under hood temperatures are over 150 degrees Fahrenheit. Even after hours of testing on our engine dyno, our discharge temperatures have not exceeded a 74 degree Fahrenheit rise, substantiating Eaton's claims of supercharger efficiency. Because our supercharger is hung off the engine in a position that receives large amounts of airflow, our total system efficiency is very high. We do not need to add the expense or complication of a flow-through inter-cooler and the loss of boost that comes with its use."

Kinda interesting and just thought I'd share. Oh yeah the 2 year 100,000 mile warrenty is nice and its smog and carb legal if thats a concern.